When Wii first came out I think they were hoping to have "real" games. In my opinion the first games that got released for Wii were the best such as Zelda. Then Wii's limitation showed as xbox 360 and ps3 games kept getting way better, and left Wii with only doing dumb party games.
This is true, I think. Zelda, Super Mario Galaxy, Super Smash Bros. are all great franchises. But after those iterations comes out for each generation of Nintendo consoles, it seems all they've got it "cooking mama."