PC + Wii = most every major title and genre covered
When I want "good graphics and a complex story line", I fire up the PC... it absolutely destroys the PS3, X360 and Wii for those kinds of games - sure, I have to wait a few months for the games to hit the PC, but so what? I end up paying less for the game, and get a superior experience. The only counter I've heard to that is that "I'm not patient enough to wait for titles to hit PC". I am, so that's moot for me.
On the other hand, when we have people over (usually drinking alcoholic beverages), we fire up the Wii. It's unbeatable in this environment. Never has a gaming device (that I know of) taken the social aspect so far. It's hard to express in words the awesomeness of playing drinking games with the Wii. I am neither a senior citizen or mentally deficient, and I think the Wii is fantastic... but thanks for lumping me in with those groups!
That said, there ARE "mature" games on Wii - just not as many as the PS3 or X360. Plenty of them in fact; more than enough to keep me interested in it for those kinds of games... The PC however eats them all - it's hard to deny that fact.
The PS3 and X360 are good systems, I like them my self - but one need not own either them to experience all the best games that come to market. That's why they can't get a foot up on the Wii.
So, ummm..... I think my point is that you should probably just get over it. The Wii is popular. People like it. It's making gaming a socially acceptable pastime, where it used to be the domain of the geek only. You're entitled to your opinion, but don't act all indignant when people don't agree, and offer their counter points.
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