I've read through this entire (pair of) threads (whew) and thought I would post my experience and observations from the point of view of a relatively recently certified diver. My concerns and expectations going into diving are, perhaps, different from most new divers; my diving buddy with whom I have gone through training is my 15 year old daughter. This may have caused me to look at things differently and more cautiously than some others.
We are certified through PADI, but intentionally chose NOT to take the weekend course. We went the longer route which took several weeks but allowed for more time with our instructor, in the water, and for the material to sink in. I challenged my daughter to beat my scores to provide some incentive, and our instructor said noone had ever scored 100% on his exams. Perhaps we lucked out, but I consider our instructor to be an extremely safety conscious and dedicated diver who has gone WAAAY out of his way to provide good training and advice to us. He certainly did make it very clear (on several different occasions) that in every way and at all times we, as certified OW divers, are responsible for our own safety. My daughter scored 100% on all exams; I got question #1 on the final wrong so she would "win". Our instructor smiled. Yeah, he talked about con-ed and buying our own equipment, but was very realistic about both when approached privately later.
It was our intent to get certified and acquire some experience before a "reward", a week diving in Cozumel. Our class consisted of the two of us and another family (a father and two children, 14 and 16), who also were planning to travel to the Cayman Islands after certification. One difference; their trip was planned for 3 weeks after our scheduled open water checkout dives locally, ours was planned for 6 months afterwards. I had determined that additional OW dives and training would be wise before taking my daughter to dive in Cozumel and left time for this.
Our fellow students did not make it through the course. Frankly, they should never have signed up. They had difficulty with the exams and had to retake several. They had even more difficulty with various skills in the pool. Our instructor had to gently, then more firmly suggest that perhaps they were not ready for this (he later told me he was tempted to tell them to take up chess instead). I have no idea why they signed up for the course, but thank goodness they did not sign up anywhere that would have pushed them through. My daughter and my comfort in the water and ease in learning the skills allowed him to leave some of our pool training to his DM assistant while he worked to try to get the others up to speed, to no avail. At the same time, we determined that certain of his standards were a bit tougher than required in the manual (in terms of repetition of skills, length of demonstration of certain skills, etc..). I am NOT complaining, and feel we are better divers for his diligence and strict approach.
After certification, we arranged to meet with another recently certified family we met during our checkout dives for a weekend of practice, locally. I mentioned this to our mutual instructor and he insisted on coming with us to "show us a few things" and help advance our training. He would only accept lunch in return. We all had a great time, and made some great practice dives.
I told him we wanted to take AOW before going to Cozumel, as I felt that we would be tempted while there to dive beyond our (then) current training. He felt that while our skills were good we should wait, but after we had made a few more local dives and spoke with him again, he agreed. We had a great time with AOW, and while we had a different instructor, our OW instructor contacted us afterwards and told us he had spoken with our AOW instructor to check and was very pleased with how things had gone.
We arranged for a smaller dive operator in Cozumel to avoid being part of a large group, and our operator insisted that we hire a private divemaster for the week because of our lack of ocean experience and my daughter's age. I was pleased to comply (this had been my intent anyway - my point here is that the operator was responsible, and insisted). Our dives were on a six-pack, with one DM for us and another for the other 4 divers. After a day of shallower dives, and despite our AOW certification, our DM on day 2 asked us if we wanted to go to 95' with the group or stay shallower, at 60'. We felt confident, and stayed with the group. After that day, we were told we no longer needed a private divemaster as our skills were very good. I said no - we will keep him / her for the week, and we did.
Why did I do this? While having a private guide to show us things is great, we were in a group of only 6 and sometimes 4 divers; one DM would have been fine as a guide. At that point I still wanted someone to watch out for us a bit, in case we forgot something or made an error of some kind. This did not mean I felt I was putting my (and my daugher's) life in anyone's hands, but that I wanted a back-up to our own best efforts to dive safely. I felt I could not count on such personal attention from a DM leading a group, and that if I wanted that level of service it could only be provided by a private DM.
Since our trip to Cozumel if February, we traveled to Utila in April. Our divemasters there were attentive and safety conscious, they did check on our air from time to time, and our ratio was excellent; two DM's in the water, captain on the boat, and a total of 10 to 12 divers. I depended on our DM's only as guides but felt they gave complete safety briefings and while one led, one stayed off to the side and observed us all. It would be easy for a new diver to mistakenly depend on such attentive DM's for much of their safety, and easy to see how this could lead to trouble in a future dive led by a less attentive DM.
Did either of us make any errors while diving? Certainly. I once jumped in without my weights in my integrated pockets, and had to quickly swim to the boat to retrieve and install them. My fault, and had I been slower I would have had to bag the dive because of the current. I apparently failed once to properly connect my inflator which disconnected upon entry; my buddy (daughter) had to assist me in finding the lp hose so I could plug it in and go. I had partially inflated before entry so while annoying, It was not an emergency. At the same time, I observed some interesting things among our fellow divers, all of whom were more experienced than I.
I found that we carried more safety equipment than anyone else. We were the only ones carrying strobes or signal mirrors in our pockets. I was the only one with shears. Several had no safety sausage or whistle. Ony our whistles were the louder storm whistles. We were the only ones with spare dive lights for our night dives. During one night dive, I happened to be near our DM At about 65' when a fellow diver approached, very unhappy, shaking a dead light. I pulled out my spare, turned it on and handed it to him. (what a huge grin he then sported!) I disobeyed my own training at that point - I was taught that when you have no spare dive light, the dive is over. I stayed with my buddy so we still had one spare and finished the dive. After all, noone else carried a spare at all - but I knew I was disobeying training.
The next day on the boat i noticed a fellow diver nursing an injured finger; I pulled out my dry box and provided bandages and antibiotic ointment. While treating her finger, the DM came by and rifled through my box, interested in what I carried (tools, spare storm whistle, parts, o-rings, silicon, etc..). She complemented our training, and said we must have had a great instructor - we were as prepared as the DM's. And we were the least experienced divers there.
In summary, I think that PADI Certification training is what you make of it, and that a lot depends on both the student and the instructor. The role of a DM on a warm water trip can be deceiving to a newer diver, even when it is made clear in breifings what their role is. It is apparent that divers often depend on DM's more than they should under such circumstances, and seems that in some cases the DM's very efforts to be responsible and watch out for the divers they are leading serve to foster this mistaken impression. I'm not sure how this should be addressed; DM's staying out of the water may help underline diver self-reliance, but then the guide function and advantages thereof are lost. I feel there IS a value to a DM backing up a group of diver's best efforts at safety, how not to lose this while not fostering dependancy by the divers I do not know. I do not depend on a DM for my safety, but do not have a problem with someone keeping an eye on a group of which I form a part.
Sorry for the long post; I thought that the opinions and observations of a newer diver might be of use. As to the original incident that generated this discussion; my heart goes out to all involved. From my point of view, the DM had a responsibility once advised of the inexperience of the diver at least to discourage his plan or decline to bring him to an inappropriate dive site. The diver had a responsibility to stay within his training and his dive plan. Neither lived up to their responsibilities. The rest still seems muddy, in terms of who was buddies with whom, etc..