Toy Story came out in 1995 and was groundbreaking, everyone loved it. It was the first Pixar movie that ever came out, it was also the first fully CGI animated movie. 20 years later Inside Out can out, it had a great story, great animation, great characters and a great lesson but everyone calls it overrated. It just came out at the wrong place wrong time. Plus Toy Story had time to age, Inside Out has not been out long enough, I bet in the future it will be considered a classic.
Pixar movies are like fine wine, the older they get the better it will become. Like when Wall-e came out it was just another Pixar movie but now it is one of the best movies of all time.
Inside out just needs to age and then every one will know how great it really is