Depends who I'm talking to, but these may be the most surprising:
Clarissa and The Straightjackets (Melissa Joan Hart's rock album from her children's TV show Clarissa Explains It All)
Concord Dawn - mostly just their 1st album/techstep stuff, but then they were metal fans and did an err... drum 'n' bass version of Raining Blood
Daphne & Celeste
Fatboy Slim - got some nostalgia for the album You've Come A Long Way, Baby but doubt I could get into his others
I don't think it's that surprising that I listen to some quality hip-hop, pop, old vocal jazz and occasionally pop punk etc. There are also some bands I listen to where I wouldn't rate any albums higher than 5/10 and I could hardly even say I 'like' them, such as Creed or Linkin Park's first album & EP.