Having grown up with the comics, I didn't think I'd like the movie one bit. I'd seen a bit of footage and wasn't impressed. But when my dad wanted to see it a second time, I caved and went along. It turned out to be very entertaining.
Though animation is very different from comic books, it didn't really bug me. Yes, the characters did look a bit different, but I expected it to be a lot worse.
This is definitely a fun movie for any age. Enjoyable if you've read the comic, enjoyable if you haven't.
And did you know they acted everything out in front of a green screen and then put the animation on top of that? I don't think that's been done before.