Low expectations that this film is somehow the worst movie Disney ever made means that you will be surprised to find that it is not. I think Cars 2 was awful and I really disliked it, whereas this I expected to hate but just found myself mildly entertained by it.
The problem with this film is essentially with the reviewers spewing hyperbole. It's an average film with an average cast and an average plot.
It's not good. that doesn't make it bad.