Action was TOO frantic!
I really enjoyed Rec 1, the action was captured well (mostly) but Rec 2 was just downright confusing half the time, with the camera going all over the place with frantic struggles and noises.
I know they're going for the realistic approach because in that situation I'm sure it'd probably be like that, but for the sake of enjoyment, they could have compromised the realism a little to capture the action with more focus.
Overall I still enjoyed the movie, and the story, but felt the action wasn't up to par with other found-footage action seen elsewhere.