Scrap that, I've bought it.. I did the same thing with N.O.V.A which turned out to be a decent game.. This better be good, I'm a huge fan of the film and don't want to be let down.
Is it as bad as the PS3 game, I brought that, played it for a week and then traded it in, was awful.
The only thing with avatar spinoffs is that the story of the movie doesn't stand up that well on its own without the stunning visuals which are the most impressive thing about the movie.
It's decent enough for a buy at 99 cents. If I were into this sort of game I could see it being worth $5-10, but I'm not really into this sort of game compared to say... a good tower defense.