By far the most cringe worthy live is late era Vince Neal, he couldn't even Get out 25% of his vocals the last two times i saw them.
Luckily for me the last time i saw Motley Crue the Scorpions open for them and killed it. Three songs into Motley i decided id'e heard enough.
Vince Neil owes me $22!! He came in to Houston to do a club gig with his 1st band after Motley Crue. There were a couple of announcements that his bus had been held up at various DWI checkpoints. He showed up at 1am (club closes at 2am), hammered. Announced that he couldn't get torn away from the Men's Club (strip club) and butchered two songs before someone doused him with a beer. He jumps offstage to fight the guy and the guy smokes him. That was great! He storms off-stage and comes back to chants of 'Neal, Neal...'. Tried one more song and stormed off.
Come to think of it, I got my $22 out of that memory. Who wouldn't pay $22 to see Neal get his ass kicked?