The first 2 that come to mind are The Waterboys' Dream Harder and Radiohead's Kid A. I don't think either band's ever gonna come all the way back from those two disasters, although at least The Waterboys are still a killer live act. Well, maybe Radiohead is,
too - I wouldn't know, because I haven't seen them post-OK Computer, and unless someone takes me to a show for free, I'm never going to.