Saw the previews and thought for sure that it was going to be a flop. Am wondering if they filmed the actors playing the Avatar and then superimposed the animation over them, because they just got the mannerisms of the actors down pat. Made it believable. I always cringe at a long running time, this was two hours and fourty minutes long, but the movie was so entertaining that I didn't notice how much time was going by. Was never once tempted to fall to sleep. Very action-packed.