The Nine Inch Nails frontman has won two Grammy prizes in the past, but revealed that he doesn't hold them in the same regard as Academy Awards or Golden Globes.
"Why don't the Grammys matter? Because it feels rigged and cheap - like a popularity contest that the insiders club has decided," he told The Hollywood Reporter.
Reznor won both an Academy Award and a Golden Globe for his soundtrack for The Social Network with Atticus Ross, and describes composing music for a film as a different "challenge".
He said: "The movie side is interesting, challenging, different and rewarding in way that I hadn't experienced through my music career."
Talking about the upcoming soundtrack for David Fincher's version of The Girl with the Dragon Tattoo, he revealed: "We spoke with David in terms of broad strokes. First, we wrote from an impressionistic gut level with no script, although Atticus and I had both read the Dragon Tattoo book.
"Then, the way David works is he films digitally at night and the team back in LA assembles very rough comps of scenes so he can see the next morning if he got the shot. So we got to see a lot more of the sausage being made, and that's been enlightening.
"It's more work in terms of redoing, rethinking and restructuring things, but it's also taught us not to be precious about our compositions."
The soundtrack was recently revealed to contain 39 tracks, and to be longer than the actual film itself.
> Trent Reznor hints at Nine Inch Nails material in 2012