Took the kids to see this today, and it might be the weakest Pixar movie to date. It reminded me of Cars as it wasn't bad, but it was meh.
The first 5 minutes of Up got more of an emotional reaction out of me than this entire film.
Now that being said, there is stuff to love here. I won't go into it all because there's one joke that's hilarious and I don't want to spoil it.
Special mention to Phyllis from The Office who plays Sadness. She is awesome. Her character is written really well and it fits her voice like a glove.
It's worth seeing once, but it's not a classic.