I think Going for the One has a pretty good cover. The worst Yes cover has to be 9012Live. Come to think of it, Open Your Eyes is a weak cover, and so is the Time and a Word (both versions). The Yes Album's cover is a yawner too. Big Generator? At least the packaging doesn't detract from the music!
I guess I have to put Piper at the Gates of Dawn as a pretty crappy cover. "Hey, let's take a band pic dressed all psych, and then trick out the camera lens."
