I liked Ratatouille. It was better than I expected, but I have a feeling that Pixar set a new benchmark with Finding Nemo and The Incredibles that is kind of hard to beat in terms of storytelling. I have to remind myself that just because it's not a great Pixar film, doesn't mean it's bad. The worst of Pixar's work is a good match for the best of most of their competition.
Interesting note - There's a little label that appears in the end credits saying '100% animation - no motion capture' which I thought was nice. The animation is gorgeous, especially the small, subtle rodent movements that are incorporated into the rat characters' performances. Lovely.
For another view on Ratatouille and a brief mention of the gender imbalance in Pixar's films, I point you towards the wonderful Rachel Holkner's review. I don't agree with all her criticisms of the film, but she makes some very valid points.