I think that people who don't have decent performing skills should stay home until they achieve them.

All the practice in the world at home won't take account of stage-fright nerves. The only way to get over that is to go out and do it. There are bound to be a few fluffs on the way.

Also, it depends on who the audience are, their expectations and whether the performer is getting paid or not. Someone just starting out, playing at an open-mic night for the fun of it, mainly to friends, should be cut a little slack. If the kids in the local school were putting on a show then I would expect maximum effort but I would forgive a few technical imperfections. If I had paid a king's ransom for tickets to the Albert Hall, I wouldn't be satisfied with anything less than top class

DC