As an adult, I normally DON'T watch cartoons.
I saw my nephew, who's 10 years old watching Avatar, he's been watching it on Nickelodean since season 1, and I'd sit and read and watch the TV for an episode here and there, and thought most Anime was the same, but Avatar wasn't really anime by looks, and after reading about it, I see it's inspired by Asian culture and history and stuff.
So, I watched all seasons over the course of 3 days and found that it is a totally awesome show, and I feel a part of me has gone, now that there's no more left.
True story, it's a cool show, even for us adults. I tried the Nick game thingy, which sucks, but hey, it's meant for kids, not adults.
The shows very dramatic and such, and reminds me of HBO's Rome, in terms of dramatic music.
Good show, I reccommend it to anyone who dislikes Anime, but likes the ideas behind it.
I mean, who doesn't like people flinging magic and such at people? It's a win-win situation.