I liked it as well... many people (not necessarily here) have commented on little character development, unlikable characters, unrealistic happenings and a few others...
I gotta be honest, I didn't catch anything that was inaccurate at all, especially related to the diving portion... The only thing I thought was unreasonable was the wetsuits they were wearing... doing a long enough, deep enough dive to incur a 2 hour deco obligation, even in temperate waters would probably warrant a drysuit, or, at minimum a very thick full suit. No doubt they adjusted the wetsuits to be attractive instead of functional...
As far as the lead guy, I think the way he goes about things is completely rational, and I liked him very much. In life or death situations, there is little room to be emotional.
As far as not being realistic as far as almost everyone dieing, well... IMO, the more realistic scenario may have been that everyone dies...
I wish I could have seen it in 3d, honestly. I think it was very cool how the movie was shot. They actually trained the actors from step 1 so that the actors truly were the ones in the dive gear. Even the sharing of the FFM - was done by the actual actors... It was a condition of being in the film that they be able to dive and do those parts themselves!
