I know that the Xbox 360 outputs a strange (darker than sRGB) gamma curve, but this has to be a problem with the game. Raising the in-game brightness doesn't seem to help and creates artifacts. I've done comparisons and noticed that both the PS3 and PC versions of Mass Effect 3 don't have gamma issues. The game is almost unplayable due to the how dark all the levels are.
Any suggestions on how to correct this problem would be much appreciated. Thanks.