I loved it. Piranha 3D is what Snakes on a Plane wishes it could have been. It's not just exactly the shameless schlockfest I thought it would be, it goes way, way beyond it. Depraved, gross, disgusting, bloody kills, and so much boobs and ass it's basically a porno movie. Absolutely shameless, especially for a mainstream Hollywood movie. This is not a movie that can be discussed in polite society. But here, I'll say for the interested and like minded, it's fucking great.
I saw it to review for our school newspaper....I thought the animation was as good as I've ever seen, but the story was lacking and I thought the characters were a bit one-dimensional. Of course, kids don't really care about those things.