Now don't get me wrong here folks, I personally have not been to it yet. I thought I would bring this to attention since I have been hearing and reading about it a bit and wanted to know all of your thoughts on it.
So, two reasons why people are disappointed:
1. They don't interact and just say "Phrases"
2. Unlike thier RSR counterparts, they're mouths don't move (This seems to be the biggest let down)
I personally was not expecting much from either Meet and Greet anyways.
Here are two video's
Talking Mater meet-and-greet in Cars Land at Disney California Adventure - YouTube - Mater
Talking Lightning McQueen meet-and-greet in Cars Land at Disney California Adventure - YouTube - Lightning McQueen