The PS2 had tons of shovelware, don't kid yourself. What was different was the third party blockbusters were at the top rather than Nintendo's stuff. EA had dozens and dozens of million selling games on PS2, 50 or so the last time I checked.
If you were to imagine the structure of the PS2 and Wii software markets as buildings, the Wii would be a pyramid with a small amount of software selling much better than PS2 games, while PS2 would have a broader, but sharper cut off at the top, more of a narrowing square shape. The Wii does have alot of room for games to sell 500,000-1,000,000 copies though, and that is why you see alot of big, but not huge stuff developed for it.
People are difficult to govern because they have too much knowledge.
When there are more laws, there are more criminals.
- Lao Tzu