The difference between the PS2 and the Wii is that I feel the PS2 targeted as many gamers as possible, with some non-gamers brought in on the side. On the other hand, I think the Wii targets a lot of non-gamers, but with a few traditional gamers brought in on the side.
I think that's a perfectly fine marketing strategy. When you're making money on hardware it's a brilliant way to go. For people like me, though, it's just not helpful. Someone above mentioned how games should go back to brains instead of brawns (visuals) as a focus, but I think that's exactly the opposite of what a lot of Wii games do. Sure, they're accessible to new gamers, but I don't think they carry the sort of complexity, difficulty, or thoughtful design I'd really like to see out of new games.
Technology is fundamentally useful in making a better game, as well. That the Wii doesn't have as much console power as the 360 or PS3 wouldn't be so disappointing if I felt they were genuinely making better games, but it seems to me developers have just used this as an excuse to reduce production costs overall. Which, really, is probably fine for people that don't have a history of gaming, or prefer simpler games, but it just doesn't give me what I want at all.
To date, the only game that makes me want a Wii is Shikigami no Shiro III, which actually has a 360 version in Japan, but only was released in the US on Wii. That game would be fantastic to own. The other stuff - the Marios, Zeldas, even Metroid Prime - just doesn't hold the appeal that their old 2D versions did. I'm not sure whether I've changed or they have, but, given my love for Mega Man 9 recently, I'm more inclined to blame the designers. So I really don't think the Wii is helping people get back to basics, I think it's just shifting to an entirely new market.