also as far as adult games on Nintendo systems- third parties are often not going to feel comfortable spending money to port a shooter or violent game to a Nintendo system when they know the market is mostly casuals and families.
I do blame that on Nintendo, as far as not pushing to develop a more adult end of their video game franchises and business. but again I don't think the lack of third parties is the issue there, Nintendo needs to create some of their own more adult IPs to give the impression of to the consumerse that they ARE a system for all categories of gamers
creating some more games in the vain of Eternal Darkness or Earthbound or something like Perfect Dark (and yes I know it was Rare)
as far as serious racing games- forget it, Nintendo's largest franchise practically is Mario Kart and they're not going to sacrafice that at all to have realistic racers
