The following contains spoilers but nothing that you couldn't expect from such a movie anyways.
I just came out of the theatre. Since I haven't seen BWP I thought the way of showing the movie (through the camcorder) was quite innovative.
I think the movie was ok, but not extraordinary.
Two thinngs bothered me though:
1a) It wasn't logical sometimes why he would disable the camera at this point during the party.
1b) It wasn't logical sometimes why he wouldn't disable the camera during the escape (e.g. when they climbed on the roof - I would have put it away and would have used both my hands)
2) No matter how large the biest is and no matter how thick its hide/armor is: The amount of direkt hits both by rockets and by grenades (I am not talking about the MGs) would have blasted large pieces of flesh out of the creature and it would have died.
But that is normal in this genre, it would be boring if the creature would die after half an hour.