While I somehow liked Cars 2 better than the first one, I think that was their low point. That was clearly for 5-7 year olds that liked the first one, and a matter of marketing.
Personally, I'm glad that we're getting the first original Pixar movie since Up. Though we won't get another original one until 2014's The Good Dinosaur. Not that I mind the sequels. I'm on pins and needles for Monster University.
The one thing that seems to bother me. Brave merchandise started hitting (Target, at any rate... I saw nothing at Disney last time I was there), and it's all overwhelmingly fashion dolls. Disney couldn't wait to have another Princess, could they? Something that has raw "I don't want to be a stereotype and think for myself" kinda girl that they can put into pretty pink fantasy dresses. Even under Pixar, they have to get hypocritical.