^
I think one of the things that put me off the most was the design of the cars. They stuck the eyes in the front screen rather than using the headlights which just seems ... wrong to me on some level.
People tend to anthropomorphize their designs as it is, including objects such as houses or cars. So in a sense, I think I perceived putting the eyes in the windscreen almost like sticking a set of eyes on a human forehead.
Plus it makes you wonder why these vehicles would even come into existence given that there is no real purpose to them anymore. They have doors and a passenger space. But obviously, they would not be able to drive anyone around (at least the notion seems weird to me since you'd be staring right at the back of the their eyes).
Now, having said all that, I'm probably thinking too much about all of this and might enjoy the film anyway. It's just one of those things that can cause you to choose one movie over another, especially since there's more out there than I'll ever be able to watch anyway. Still, it's Pixar, so I may well give it a chance at some point.