Wreck-It Ralph was really good fun. There are many glimmers of the genius that Pixar used to display as a matter of course but has recently been unable to consistently produce. I don't know if there's any collaboration between Disney Animation and Disney-Pixar, but something's certainly rubbed off.
The many video-game references work well and never end up embarrassing, which is often the risk when tapping in to a popular subculture. It's a family comedy with relatable characters, a well-told story, genuinely funny humour, and a little twist I really didn't see coming.