Not bad for a movie spin off.
This game suffers from the same faults as many other movie tie-in games. The controls and gameplay are a mix of things taken from other popular games, so apart from the (pretty good) avatar visuals, the game feels unoriginal. The missions are similair on each map and get repetitive.
On the positive side the game is fun and easy. There is a Naavi and human campaign offering many weapons, vehicles and rideable creatures. There is also a third gametype, like a simple rts. I personally haven't tried multiplayer, but it's there if you can find games. The evironments and character models look very good and are true to the movie.
All in all not a bad game, I rate it higher than most movie spin -offs.