Think I'll give it a miss. I can't get into CGI or people dressing up as aliens. Maybe worth watching later on BluRay to see what the graphics are like.
The story is actually very mature and has universal appeal. You just need to get past the blue people, which you literally do like after 30 seconds of seeing them. But oh well, can't please everyone.
I saw the trailers for this and it looks amazing. As tempted as I am to see it in 3D, I think I'll stick to 2D as my last 3D film ended with me jumping on a complete stranger because I thought the character was really coming out of the screen for me and I had to duck.
The 3D is very well executed, and it's not "jump out at you" gimmicky, but more immersive. In fact, I don't remember any peek-a-boo jump moments. Trust me, you've never seen 3D employed quite like this, it's more like a window into another world.
I think the legal age is 12, it is in this canton at least, so don't expect for them to be admitted. It's a bit violent at times, but they'll love the imagination on display, especially if you see it in 3D. They'll be bugging you and asking you if Pandora is a real place afterwards.
There are some emotional and sad scenes towards the end, but nothing as intense as more recent blockbusters like The Dark Knight, for example.