At the moment IMO you are overthinking this with no direct experience, which is a combination virtually guaranteed to lead you to inaccurate expectations. My advice is to abandon your preconceived notions and go to Cozumel prepared to adapt to what you find when you get there. From what I have seen here I think you would be happier on a fast boat with a small group of divers, which is quite easy to arrange. Pick a reputable outfit with small boats and go diving, and plan on a return trip where you will tweak your plan in light of what you experience this time. Rinse and repeat.thanks. i did get the impression that it was "infested". From most of the feedback, the picture that had been created in my mind is not a real concern to worry about. While I know diving drunk isn't allowed, I got a little bit of a spring break feel from some of the stuff I was reading, coupled with a fair number of reports where people clearly communicated their preferences to a dive op, and then those were seemingly ignored a la @brsnow. To me, that is unprofessional when someone is spending a fair amount of their money and their precious time on a hobby they are passionate about. If I lived somewhere where I could be in the water every day, I probably wouldn't care as much. But the incredibly small percentage of time I get to spend underwater and the cost of that, makes me want to do my best to mitigate as much of a chance of disappointment as possible.
I also try to be tolerant in general but especially with diving as I'm still learning myself and certainly far from perfect. And oddly the majority of people who have negatively impacted my dives were more seasoned divers. But even still it was only a small portion of the dive that was impacted. Even my worst dives were still great so far. No major issues.
Ultimately I think you hit the nail on the head with my preconceived notion of Cozumel diving. Thanks for correcting that.
As for brsnow's experience with the Blue Angel dive op, as I replied to him, my (many) dealings with them have always been very different from what he reported. I found them to be responsive, reasonable, and professional, and my requests were never simply ignored. They were not always resolved as I wished (though mostly they were), but when they were not they were always explained to my satisfaction.