I'll go ahead and get this easy one out of the way....Milli Vanilli.
I have to admit I loved their songs. Their music was very vocal heavy with great hooks and melodies. Those guys could SING! Oh wait....no....they couldn't!!! Hahaha...oh sorry I guess I shouldn't laugh at the vocally challenged, hell I can't sing. But I never won a grammy and stood there and accepted it with a smile on my face either.
But my jab at them is only for their intentional fraud over the fans and the music industry. I know that Rob Pilatus died, and I wish he had not.
From Wiki
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Milli Vanilli became one of the most popular pop acts in the late 1980s and early 1990s. However, their success turned to infamy when their Grammy was revoked after it was revealed by Chuck Philips of the LA Times that the lead vocals on the record were not the actual voices of Morvan and Pilatus
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And remember what gave it all away to begin with? A technical difficulty started the rumor. One of their tracks STUCK in a live performance.....all downhill from there....
Milli Vanilli LipSync Skip 466NOW 0001 - YouTube
Grammy Acceptance
Milli Vanilli wins Best New Artist Grammy (1990) - YouTube
And here we go on further downhill....and Milli Vanilli is Kaputz
Milli Vanilli press conference (1990) - YouTube