I did enjoy the spectacle of the end fight, but I agree, especially on the ground assault. Better use of the environment would've been more realistic AND more interesting.

I also felt that the Eywa animal attack felt a bit forced, as each amazing creature we "met" earlier in the film was reintroduced to strut their stuff in battle. They could've at least had some more as-yet-unseen critters introduced without all the back-story for each.