I'd also love to say that Jimmy Cameron actually stole the major concept of the film from the odd Osamu Tetsuka film Cleopatra... but unless he frequented X-rated cartoon showing movie houses in the 70's, that's not likely... the whole sending a crew via virtual reality bit... I don't recommend anyone actually look Cleopatra up, though... unless you're 20 something and morbidly curious. It's not a bad film, but it's very VERY weird. Some of the weirdness is just... out there and you can't unsee it. Ever. Though, the assassination of Caesar being a Kabuki play should be required viewing for anyone who wants anything to do with animation.
As for Airbender... really... I would love to say it's a Nobel effort... but Shaggyman ruined it with his direction. I almost didn't think they were still making the film, and when I first heard James Cameron doing Avatar, I actually thought it WAS that movie. Again, it's one of those films that couldashouldawoulda been better, but too many problems arose with in it. At least they got the character names right, and they looked, for the most part like their cartoon counterparts. Seriously, I still don't see Mathew Broaderick being a fit for the lanky, Don Adams voiced, oblivious Clouseau-esque Inspector Gadget... and the only reason I'll except Rosie O'Donnel as Betty Rubble was that she did the laugh pretty good... still think Rick Moranis, as precious a comedic metal he is, was a bit too neurotic for Barney. But Robin Williams BECAME Popeye. he disappeared into the role. And uh... well, Shelly Duval IS Olive Oyle. And... that isn't a compliment. She really looks, sounds, and talks like Olive Oyle.
Really, making these cartoon based movies is a crap shoot. You could get everything possibly right down to minor character names like Speed Racer, and still fail, or you could just slap together Underdog out of a generic talking dog movie and fail just as bad.