As for what I didn't like: 1) The opening narraration was delivered a bit too seriously for the subject matter--not the parts about what happend 3000 years ago, but the parts about the Turtles.
Granted it was forgotten pretty quick, but it did give a bit of a poor first impression.And, 2) even with training from Splinter, I highly doubt that April would be capable of taking on Foot Ninja. In the second movie she couldn't even use nunchucks right and it takes years to really master any martial art.