My first thought was Oasis with Be Here Now
, given the effect it had on their popularity.
Catatonias Equally Cursed and Blessed,
seemed to have a similar effect on theirs. Probably too many ballads for a pop band. Apparently some of the Verve disliked Urban Hymns
, which is just mindboggling.
And if I can name a solo artist in a thread with band in the title, I don't think anyone (band or otherwise) has achieved the fall in sales, credability and popularity that Alanis Morissette did with Supposed Former Infatuation Junkie.