After seeing the previews for this movie, my whole family has been greatly anticipating the movie's release. We saw it today at the theatre in 3D. It was truly a fantastic experience. My kids - 13, 10, and 6 all thoroughly enjoyed the experience, as did I! The story was truly enticing and kept the kids attention the entire time.
My 6 year old was the only concern, but she is used to movies like Harry Potter that have intense situations and magical beasts. She wasn't phased at all in the movie.
I like that the movie had no bad language that I can remember and very little blood (except for some scrapes on Alice's arm). There are some dark moments that are classic Tim Burton, like Alice having to jump across some decapitated heads to get to the other side of a moat. But again, I don't think it was too intense or creepy for even my youngest.
Only bad moments were brief. I didn't like the "falsies" worn by one of the Red Queen's entourage, nor the White Queen spitting into something she gave Alice to drink (immitative behavior). And don't be surprised if your kids go running through the house immitating the Red Queen and suggesting you chop off everyone's head, including the dog.
To round out my review, this is a very clean and exciting family film. I give it five stars from a movie story, effects, and famliy-friendliness perspective. I can't wait to see it again!