OK.
Gears of War - 5.88m
Assassin's Creed (360) - 4.49m
Resistance - 3.59m
Assassin's Creed (PS3) - 3.36m
Uncharted - 2.34m
Bioshock - 2.16m
Left 4 Dead - 2.16m
Mass Effect - 2.04m
Saint's Row - 1.94m
Lost Planet - 1.77m
Dead Rising - 1.65m
Crackdown - 1.49m
Army of Two - 1.46m
Heavenly Sword -1.36m
All those were new, mature IP's that enjoyed a good amount of sales success. I'd say this proves that even mediocre games like Heavenly Sword can be successful on HD consoles.
Now I want you to find me about that many Wii games that are new IP's and are mature games and sold reasonably well.
Those stats (or lack thereof) are what I use to form my opinion that the Wii has not proved itself as a viable mature gaming platform, in comparison to the HD consoles. I think developers also take this into consideration when deciding which platforms to design their game for, leading to what I believe is a lack of new mature games on Wii. Maybe my thinking is wrong here, but I honestly would love to be proven wrong.
# of games above 75 on Metacritic (including downloadable):
360: 241 DS: 144
PS3: 152 PSP: 126
Wii: 85
