I'm a little irritated by all the irritation being expressed here ... Audiences expect an act to be extremely slick, with virtually flawless musical performance, and they expect performers to be comedians as well as musicians. Some people have to rehearse endlessly a limited number of pieces and a few jokes to be able to deliver this kind of an act. I'm sure most of them would prefer to be able to step onto a stage completely unrehearsed and blow the house away with their musicianship and rapid-fire repartee - but MAYBE THEY'RE JUST NOT THAT GOOD. So - you thought they were great, you find they don't stand up to a second listen and you're disappointed - it's nothing to get worked up about; just cross them off your "must-see" list and move on.