I pretty much agree with everyone here in what worked and what didn't. The mass majority of the film works very well, though.
The CGI does feel a bit weightless compared to the first movie although technically improved as some have said.
The raptor squad worked far better than I anticipated it would. It held some sense of realism within a completely ridiculous idea. Their relationship with Owen, specifically one, I thought was charming but not overdone.
Seeing Rexy again was so great. Her introduction, if you will, was just about everything I wanted. The only gripe I have with her is that we never really heard the quintessential T-Rex roar we've come to know and love. It was there some, but not in full length per the end of Jurassic Park.
The characters didn't bother me at all. Sure, some were a bit two-dimensional but I was never once annoyed by any of them. The brothers had great chemistry, Claire and Owen worked well, Masrani was down right likable for the most part and everyone you were supposed to hate you did (or at least I did).
The I-Rex proved to be very well done. She was threatening, imposing, powerful, creepy, "believable", and it was so much fun to hate her. Something that made the ending so worth it.
And thank goodness Colin gave us the ending shot that he did.