I did watch Ratatouille when it was released quite some time back, and yes it definitely a really cool animation movie.
It is fun, heart warming, but it does not patronise its audience as some of the other hollywood animation movies(i.e Flushed away, surf up etc).
I especially enjoy the hero of the show, the rat, as he is an average rat with a gift, and also the food critic, anton, though he was rather cold at first, but towards the end of the movies, you realise that he is rather too passionate about his profession.
In short, a cool movie that is definitely worth a second or third watch.
take care man
(p.s. My girlfriend found the movie rather so-so, to my surprise!)