My kids are 11 and 13 and both of them love the Shrek movies, not only for the 'cheesy' storylines but for the 3d aspect as well. Don't forget, there are a LOT of Poser/3d users who are parents, so there are lots of kids out there who actually know all about 3d.

And you know, sometimes it's nice to sit back and watch a movie that's got a simple storyline, has no gratuitous sex scenes and has 'laugh out loud' jokes.