Non-metal albums by metal bands

Even outside of Damnation, Opeth has a bunch of songs I love that I know if it wasn't them playing it I would probably hate it... but because they're playing it, it seems so awesome and a little bit metal.
 
The Showdown is just an identity crisis cleverly disguised as a band. One minute they're belting out some mildly amusing death metal, the next they're experimenting with some awful "biker rock", then the next thing I know they release an acoustic album. There's nothing wrong with a little diversity, but pick a goddamn genre!