"Telepathic Surgery" by the Flaming Lips (commonly perceived to be their worst LP, including by the band themselves). I think it's ace, even if it doesn't quite have the scope of their later major label albums or the rawness of their earlier stuff on Restless). I can understand some people not getting it because the songs don't hang together in a way that makes any linear sense, but its disjointedness is part of what makes it intriguing to me.
The Stones' "Their Satanic Majesties Request" is another one I'm fond of which tends to get a critical kicking.