I think Kanye is a dick, but I don't know anything about his music. If I've ever heard anything by him, I never knew it.
I think Taylor Swift is cute, and some of her songs are catchy, but they're not my thing.
I think Beyonce is pretty, but I don't know anything about her music. I've heard the chorus to "Single Ladies", that's about it.
I think Tenacious D started as a parody/joke project, but were surprised when they gained a serious following and are now trying to be a serious act, but aren't actually very good at it. Their talents lie more in their ability to mimic a genre, not actually perform in it at top level.
I know a few Beck songs and he's pretty good so hats off to him.