We dove 288 for the first time May 9th and had a great dive. The highlights were the "spooky sunken school bus" and a little perch who apparently had seen a vienna sausage before--he gobbled them up like crazy. I don't know, it is just fun to feed fish underwater. This was especially good since I have seen the video of the bozo who teased a moray with a hot dog and had his thumb bitten off. No chance of that with the denizens of 288. The vis was "murky green", which, to my mind was a plus. It is very, very clear to about 10' or so out and then it goes foggy. So, as you swim up on things they appear out of the fog, but not enough such that you run into them.
We dove Mammoth last year and will be going back at some point this year. I really cannot argue with anything anyone else has posted, it is a work in progress. Since I am seriously addicted to scuba and Texas has the suckiest scuba sites (per size) of any state in the US, I really can't complain and dive what I can. I draw the line at Smith Lake as it is über-nasty--but the folks who use it regularly are senisitve enough to all these jibes that they may get out there and clean it up.
Blue Lagoon is just fantastic since the topside scenery is so bucolic and meditative. Again, I cannot dispute anything anyone has said.
Ask yourself, do I need to dive 100' viz every dive? Do I need to see moray's and rare nudebranch's on every dive? Well, if you do you are far too prissy to live in Texas.
Happy diving!