Too...colorful? Seriously? If that's the case, just turn all the colors on your TV down to 0, and bam! no more annoying color, because its all gone greyscale.
Honestly, I'm glad they've decided to take a leap, which I'm sad its considered one in this day and age, and add fucking color to their game. Real is NOT brown. I can count at least a dozen colors within 2 meters of me right now. The real world has fucking color, brown doesn't make your world "gritty" or "realistic," it just makes it drab and fucking boring.
Bring me back to the days of colorful games, like Ultima, Nox, Symphony of the Night, and System Shock! Shit, Thief has more colors than modern games, and you spend (if you're playing anywhere NEAR properly) a good 90% of the game in the dark!