If you think about it, it's pretty funny how the whole movie kinda played out like an MMO of sorts. First Jake has to grind until he can earn his mount, the banshee. Then later, he gets his epic mount, the... big red flying thing.
First Neytiri uses her regular mount, then later she gets to upgrade to an epic mount, the black jungle panther alien thingy.
Stephen Lang was sorta like a raid boss. Phase 1 has him up in his giant gunship lobbing missiles for major long range DPS. Then, once you get his health down enough, he goes into phase 2 and comes out in his AMP walker suit. Phase 3 starts when he loses his gauss cannon and starts meleeing you with his giant combat knife.