Honestly, I felt the first movie was done with a more serious tone and was SOMEWHAT believable. The sequel was very silly. The whole in the first one where the guy scaled the building and Will ran up after him was more sci-fi and serious. The sequel has Will Smith chasing a giant worm in the subway and wacking his head on steel-i-beams that OBVIOUSLY would have killed him. It was kind of comic-book-ish compared to the original. The first one also had the EGGER suit, which could have quite possibly been the best part of the whole movie, and the sequel didn't even make reference to it... I think they just pushed everything a BIT TO FAR and it went from being kinda believable to just outright silly.