Just saw the film...
Um... It's not good. It definitely had potential, but it was not good.
PROS: Reasonably good VFX, some decent kills, a very interesting premise, decent but not spectacular 3D.
CONS: Possible the worst acting this side of PLAN 9 FROM OUTER SPACE. In particular: Dan Wyllie. The script's premise is interesting, but the dialogue is so painfully bad it physically hurts.
If you go into this film expecting a comedy... you'll be pleasantly surprised. Although, it's not a comedy. They made an unintentionally hilarious film. The film is incredibly slow for the 1st act, establishing characters, etc. Once the Tsunami happens and the sharks come it's better although... it's not good. It's just better.
On a scale of 1-10... 3 tops.