Seriously.  I wasn't particularly sold on it from the trailer, but the movie is really, really good.  It's definitely right up there with Anderson's live action stuff.  If you're a fan of his at all, you really do owe it to yourself to see it on the big screen.  Even if you're not, go see it anyway -- it's a really fun movie, with such charming, beautifully shot animation; I really don't see how anyone could not like it.