Thoughts on Cover Albums? Good? Bad?

[PokrLikeItsProse]

I thought I'd just toss this out there since we've had threads on good and bad individual cover songs.

Some albums are entirely composed of cover versions. They can be a single artist covering several artists, such as Acid Eaters by the Ramones, Jackassolantern by Widespread Panic, or Strange Little Girls by Tori Amos. Others can be several acts covering songs by the same artist, such as Led Zeppelin tribute album Encomium or the soundtrack to Honeymoon in Vegas. (These are all albums that I have and like, to give you an idea of my tastes.)

From the threads, it seems like some people would cringe at the idea of an entire album full of covers. Do you have favorite or hated cover albums?