CARS:
The only thing that bugged me at first was the absence of drivers/humans and I couldn't help but think "how'd they built cities without hands?" but once you get past that it's very decent.
The movie is in large part about the consequences of progress on "the good ol' days" and how the younglings today are so consumed by popularity/wealth that they often forget about the important things in life, like real friends.
There are some very funny moments but it's mostly just amusing and there are some slow parts.
I didn't find it as tear-inducing as Nemo or Toy Story but there is a decent nostalgia factor.
The animation is truly superb and I think they made a breakthrough with artificial lighting. There is one particular shot it looks like a weird live-action thing because everything seems real but the car is talking. I was mesmerized.
It's also a "guy" movie, especially those who like and/or know about cars and famous drivers.
I prefered The Incredibles, Nemo, Shreck and Toy Story but I thought it was better than Monsters Inc, Over the Hedge and Ice Age.
I didn't read any reviews yet so mine is unbiased. I give it 8/10.
I hope this helps.