It would be boring to mention artists I don't like. Someone I like, but have zero interest in seeing live is Adele. It's not that she's isn't good (she is), but the occasional YT vid is enough for me.
Someone I'd be unsure about seeing again is Florence + the Machine. Her vocals were so shouty and loud (Xtina, who?).
And sadly I'd think twice about buying Janet tickets cuz she'd probably cancel the second I arrived at the venue somewhere at the other end of the country.