Soleron on 20 January 2010
They're all different styles, in fact many of them are considered the best in their genre this generation (Mario Kart Wii, NSMB Wii, Super Mario Galaxy).
SMG2 is the only one that is similar to previous games and could be considered unnecessary because it doesn't attract new customers. Contrast with the number of Call of Duty or Guitar Hero games that appeal to exactly the same customers and it's not excessive.
