If you're seeing something in this film that I never saw, Chino, I'd love to know what it is. I'm always open to at least attempting a re-evaluation of a film from another perspective, though I can't guarantee that it'll end up changing my opinion on the film or not.
I think a big part of it for me is not so much the movie itself, but the years that it took to make it. Granted I love the movie, but after watching all the behind the scenes stuff, I fell in love with it even more. My appreciation of what went into the movie is more than any other movie I've seen. Describing it wouldn't do it justice. You'd have to actually watch the behind the scenes. I'd be willing to mail you my copy to borrow if you'd be willing to actually watch it.
Eh, I got my dad a copy of the film that should have that in it. Thanks for the offer though!
Having said that, I am personally an amateur filmmaker myself. I act, I write screenplays, I edit films, I've helped build sets and I'm currently learning how to direct as well as learning how to be a cinematographer too. Granted I do this with the local teen film group at our local library, but I do have a level of experience in making films.
I definitely appreciate what goes on behind the scenes in making a film and there is no way that I could watch Avatar and not at least respect what Cameron managed to accomplish for film-making in terms of special effects and the long amount of time he invested in making the film.
However I personally find that for what you've listed as Avatar's qualities, it's just not enough to be deemed a "great" film for me. There has to be substance to the story and its cast for something like that. It gives the film far greater longevity and a more emotional attachment for the audience.