My biggest trouble with Cloverfield was that everyone in the movie was 24 years old, super rich, beautiful, and super sensitive to everyone around them. And that right there is what put the big "fake" curse on the movie. I actually found the giant monster to be more believable than the people. A sequel will almost assuredly give us more of the same kind of cast, a story even less compelling than the first, and a monster whose appearance we're no longer curious about because we already know what it looks like.