The movie was a lot of fun. Either a strong kid's film or an acceptable retro-flashback targeted at adults, either way. Animation was pretty good for the turtles--it's probably a good thing they're reptiles, because the camera spent a lot of time lingering on crotches. Don't really know why.
April was a little too competent for my taste, she was always supporting cast to my mind, not a sword-swinging action hero. It's good to beef up the ONLY female role in the movie (well, besides Donatello--what, you didn't know?) but almost creating a new character for her, that was overdoing it a bit.
I've got my fingers crossed for Rock Steady and Bee-Bop in the next film, but it seems unlikely, somehow. We'll see what happens.