After the "fail that was Avatar", you may not like it but it was not a fail. It got terrific reviews, and it's currently the highest grossing movie ever made, and it won three academy awards. So fail? no.
I don't think an ME movie would cut it for me, after their horrible ending, but I'd like to see them try, though James Cameron would do a great job at it. He did "The Terminator", and like you said "aliens", "Terminator 2", "Titanic" and others as well. He didn't do as much as Steven Spielberg, but he is a great visual effects director. For visual effects, he would be great, and for writing the story too. Who else would be ingenious enough to make a movie like "Avatar"? Plus: this may seem out of subject, but I hate Avatar: The Last Air bender, so at least I can refer to one of my favorite directors. LOL
Well, I guess I should have clarified, since the comment seems a lot harsher in hindsight now. When I meant 'fail', I meant to me, personally. While a critical and box office success (neither of those mean it's 'perfect' though. Bayformers made record amounts, too), to me, the movie was a little... less than expected. I enjoyed the first half, with the great, well-realized and created future. But as it progressed, so did the stupid green aesop that truly formed the center of the story, which is probably what turned me off the most. Most of my justification as a failure are personal nitpicks. I just don't want to see the ME movie with a badly-delivered moral or fall to the same nitpicks.
But, I do like James Cameron as a director/producer. Again, Aliens, Titanic, you listed them already. I'm just tentative to letting him handle this universe, the same way I'd be worried if Spielberg or Abrams (both with their own fails, both critical and personal) or anyone else were making it.
As for the other Avatar, the show was okay, the movie was... bad, to say the least.
It's funny how you responded in a more scholarly way, a youtube user however would reply in a hostile manner. Basically you're saying it in your opinion, that doesn't make it a fact. But I would love to see a Mass Effect movie by James Cameron, he is seriously a gifted man, he has imagination and originality. And I hope to be a good director like that one day...
Yeah. Again, I should have clarified. I really think that a Mass Effect movie about the games wouldn't be a good idea. None of the characters would feel right with different-faced, different-voiced actors playing them. I think a prequel would work, like something about the First Contact War or even an interquel. James Cameron would not be my first pick, but he'd still be good for it nonetheless. Again, personal nitpicks just did Avatar in for me, not everyone else. Though I know a number of people who were rolling their eyes about halfway through at some of the stuff XD.