Then what is it, then? How about you tell me your favorite film of 2012 and who you thought was the best director, and what the difference is.
My personal preferences aside, I'd offer up George Lucas and Tom Hooper as directors who have benefited from collaboration.
I see what you're saying and understand that position, but the film doesn't begin and end with the director. Look at it this way: Direction is a very large part of making a film. Cinematography, writing, acting, sound, editing, etc. are all also part of that equation. To what degree is debatable, but what isn't changed is that all of those factors together make a film. I would say the best film of the year is the one that gets the best out of all those categories together. The director who did the best job can be separate.
Tom Brady can throw for 4000 yards and 40 touchdowns in a season and be the best quarterback that year, but the Patriots might not be the best team, even if he was a hugely positive influence on the overall performance (not a perfect comparison but close to the point I'm trying to make)