We took my daughter and her friend to see it yesterday. And while I will say it got a little 'long' in the middle, we all enjoyed it very much.
Truthfully though, I could have watched two hours of Wall-E wandering around the earth collecting little treasures, making cubes and going back to his little hideout. The animation in these scenes was gorgeous. I didn't even need the rest of the story, lol. Granted though, the movie wasn't made for me.
Oh, and the sound effects through the whole movie are ingenious, subtle and very effective.