Loved it.
Don't know what all the whingers are talking about.. dinosaurs are throughout the whole movie. I'll admit, it's quite fast paced, but I doubt they would have been able to answer as much, if it was any slower.
No, they didn't 'develop' the characters, that's because we already know who they all are. The new characters told us enough for their amount of air time.
It's definitely worth a watch, it answers a lot of questions and there's a few good scenes that send you back to original. Even a death scene.
Good times.
Go watch it.