Monsters U. is criminally under appreciated.
I agree. It was a very good film. I think after the messes that were Cars 2 and Brave that the 'haters' just wanted to rip any/every thing Pixar did. Also, people who are Disney PURISTS (sounds like racists to me) got big heads after Tangled and Wreck It Ralph were successful and then Frozen was a cultural phenomenon forgetting that the top leadership of WDFA is the top leadership of Pixar!
I think that's why you're seeing a film like Inside Out that did HUGE box office and set records while another HUGE tentpole was breaking records ... that was 100% fresh when last I checked the produce section ... engender some of the many negative comments I've seen online.