Well, it comes out this Friday, and through a small sample size of 25 reviews as of now on RottenTomatoes, it looks to be Pixar's first true "dud," so to speak (currently standing at 52%):
I don't really know what to say, but I expected this. I'll still be seeing it, and I'll hold onto hope that it's better than most animated films out there, there's no denying that. It's just that, with Mater's reprising role jumping into the lead position with Lightning McQueen, I think most of the jokes will be for the kids. I just didn't think Pixar would "stoop" to this level, per se.
We'll see how it turns out. I'm sure it will be a fine animated movie, but I think it's a different targeted demographic than the TS3 crowd.

Comment