It doesn't matter if there are mature games for the Wii, or hardcore games as well. The point is that both the X360 and PS3 have vastly superior library when it comes to core/hardcore gaming. Saying "we have core games" is the same as saying "we got Bayonetta for PS3, so it's cool!". You cannot simply HAVE the games, in today's competitive industry you need to actively try and have the best product offering, or people will go elsewhere. It is obvious that Nintendo alone cannot support core gaming on the Wii, despite wonderful games they make (Metroid, Zelda, Mario, etc.). However 3rd parties see where the money is, and they go to PS3/X360. CoD MW 2 sold 6.5 million? How much of that is on X360? Would it sell so much on Wii? Ofc not, the user base is different.
The blame rests both with Nintendo, for not encouraging core games development early on, because they were to concentrated on pushig casual titles; as well as on 3rd parties, who treated Wii as a means to make a quick buck aka shit games, and when it didn't work they go "omg, hardocre games don't sell on the Wii".
IMO the situation will not improve this generation, the % of casual gamers on Wii is too big right now. If Nintendo wants to bring back hardcore it needs to push hardcore games from Day 1 on their next hardware.
