The other companies, who don't like to put effort into making games, like the Wii and think more people will buy their game because it's on the Wii. I hate to see a clutter of Wii games with only 2 or 3 that are remotely good. At least most of them that are remotely good are pretty darn good, like Brawl and Twilight Princess. I really wish that Nintendo would make more of their own games, though. We still need to see a Kirby, StarFox, F-Zero, and Pikmin game for the Wii. If they were to revive the Kid Icarus series on Wii or make another EarthBound game, that would also be nice.
All these little girl games are ridiculous, though. Even if the Wii has choices for everyone, it has too many choices for 5-year-old girls who aren't even old enough to have to make decisions out of huge numbers of things. XP
Luckily, I have probably 20 Wii games and over half of them are pretty good. I fear that I may own every good Wii game out there.:S