Let's be honest, the only thing wrong is that there isn't more of it...
I see the same crap on so many threads about x movie being the worst movie I've ever seen, blah blah blah. And of course ID:R is no different.
For me, without being influenced by others before actually seeing the movie and deciding for myself, I thought it was a pretty decent effort. Great special effects, particularly in 3D, and pretty entertaining overall. The only real issue for me was that was wasn't more of it.