For me...
Tin Machine (1st album from David Bowie's band); thought it was BRILLIANT at the time. Still do; well some of it. Loved the immediacy of it.
St. Anger - Metallica; the last album, critically panned and most fans seem to hate it. Coming to Metallica relatively recently, I listened to this with an open mind which perhaps some already existing fans were not quite able to do as it was a fairly radical move away from the formula. No guitar solos, seemingly little songwriting discipline, appalling snare sound, some of the weirdest guitar sounds I've ever heard, sheer, unadulterated anger...and I love it! Some tracks are a bit wearing though I think.
Trespass - Genesis; not hated I think, but doesn't get the recognition it deserves I think. Some tracks are stunningly beautiful.
C