Two of the chiefs of Eurogamer.es have been discusing about the convenience of using Black & White (and red) as the only colours in the game.
On the one hand, Albert Garcia thinks that using B/W gives the game a special personality, and also helps to magnifice the ultra-violence of the game
On the other hand, Xavi Robles is sure that this game should have been in colour: the reasosns to mantain it B/W are the limited possibilities of the Wii showing detailed textures. The games becomes more and more boring because of its poor use.
Hit the link to find more reasons for each one to defend their opinions.