I love this movie
I have never watched the Avatar series so I have no idea how close this is to that. I do know that the first time I watched this movie in the theater I love it. It was action-packed and kept me interested the whole time.
I think it's a shame that so many die-hard fans had to nitpick at it. Any movie based on a TV series is not going to be complete. There are time constraints to consider.
I think if this movie were made before the series and it was allowed to stand on its own, then it would certainly have done far better than it did. I just watched it for the third time tonight and it still keeps going till the end. Such a shame that I will probably never know how the story concludes since a sequel is unlikely. :(