It's because most of the wii's hardware numbers are not from gamers like us. It is people like my mom and grandma who both have a wii, that make it seem like the good titles don't sell well.
If you take away all the older people(i mean the people who bought the wii for games like wii fit, i.e. my mom and grandma). Then the hardware numbers would be lower or comparable to the 360 and ps3. If you take that number as the installed userbase, then the games performed reasonably well.
We can't except people like my mom to play silent hill, madworld, fire emblem: radiant dawn...etc. I was like you earlier this generation, getting pissed off that stupid casual games sold INSANELY well, and good core titles did not, until I realized the wii userbase is splintered right down the middle, if not more so in favor of the casual population.
All I am saying is realize that you really have two completely different user bases in the wii base.
Fact: Earthbound is the greatest game ever made
