I think video games are a lot like Pop Music now. It breaks down into three tiers.
1) You have your garbage pop artists, where they sell a crap-ton, are totally formulaic, and music snobs can't wrap their head around how they sell so much. Since I like rap, I'll say these are guys like Soulja Boy. No imagination and pretty much awful. On the Wii this is stuff like Carnival Games, and probably a bunch of other stuff that I will never, ever waste my time researching for the sake of presenting as evidence in a forum post.
2) Then you have your artists that straddle the line between critical acclaim and street cred. Guys that come to mind here are Jay-Z, Kanye West, and Ludacris. Both pop people and music snobs have to acknowledge their talent. On Wii this is stuff like Smash Bros. Brawl, Mario Kart Wii, and Super Mario Galaxy. This is pretty much "universal respect" territory.
3) Then you have underground artists that music snobs love, but their appeal is lost on most people. A lot of people won't "get" these groups, but those that love them love them with a passion. I'm not a backpacker so I can't think of many rap examples here, but groups like Company Flow/El-P and Aesop Rock come to mind. On Wii this is stuff like No More Heroes, MADWORLD, Fragile. The obscure stuff that breeds snobbery.