Just got back from watching it. Im not going to spoil it by saying what happens, but this is my honest review.
I think it was heavily over-hyped for what it is. Its not a bad film like people are saying, but its not a blockbuster either. Like people have said, some good acting especially by Woody Harrelson and Danny Glover. I'm not a big fan of Cusack, but he was ok in this. The CGI is fantastic and probably over done at times. They could and should of made a few more deaths, but that would of put up the rating. Yes it is a long film and some parts should of been edited. The main story could of been altered too to make it abit better. If you have seen Deep Impact, its just that type of film. Disaster film, but doesn't get you sitting on the edge of your seat.
Worth going to cinema and watching it? Maybe. If you've got nothing to do, then yes, go and see it.
Would i buy it on DVD? No
Would i watch it on Sky? Yes, but i wouldnt be giving my whole attention for the whole film as ive already seen it.