Yeah I watched it. Mildly entertaining but pretty poor overall. The lead character (Dylan) was so unlikeable throughout IMO. There was hardly any character development so I found myself not caring about any of them. It had some good bits though, good effects and action sequences.
Yeah, I hated Perfect Storm too
(by the way, seriously, I did!)
Poseidon was OK, like others have said, a fairly irreverent way to pass 90 minutes, but it could have been better. Not keen on the characters really, but not bad overall.
I enjoyed it. The deaths were pretty horrific. Especially the first guy i nthe elevator shaft. When the guy shouted "shake him off," I had to hide behind a cushion.