Well, it seems trailers usually don't make the movie justice.
There have been lots of movies I haven't seen the first time because the trailer looks "Meh", and, to be honest, Inside Out looks like one of those. Nice to see it compared to Spirited Away, although I don't think of it as a "Masterpiece", but still pretty good.
My favourite from Pixar is Ratatouille. I can watch that movie two, three, four, five times a week and do the same the next, especially now that I can play it on Netflix, and I also like The Incredibles and Wall-E, and in a lower scale, their movies before those (Nemo, Monsters Inc).
I feel that their newer movies aren't that great, though. While I loved both Toy Story 3 and Up, I wouldn't watch them again. I liked the concept of Cars and the imagery, but for me, the movie was boring and slow. I can't even imagine what Cars 2 is about.
Brave doesn't interest me in the slightest, I might watch it someday, and the only thing I remember about Monsters University is that that was the first movie I watched with my (then) girlfriend.