I seem to be in the minority but I thought that the color palette of the overall game was fine and diverse but could that be because I was playing the PC version?
The problem with the game for me was the very generic gameplay which was overall fun with nothing really broken but not much different to 'arcade' style action shooters from years ago.
For me they have gotten much right to get my attention such as the feel of the game story, characters and world but as far as level design and overall gameplay mechanics go, it is pretty much a 'Been there done that' sort of game.