I probably wouldn't complain if the dancer just looked like she needed more skill. I wouldn't like it, but I probably wouldn't complain. Instead, if I went back to the restaurant on a different night and saw a much better dancer, I might consider contacting the restaurant owner to say how much I liked the GOOD dancer.But I have seen dancers I thought of they can be replaced or need some extra lessons. However not sure if that needs complaining. Sounds liek such a horrible thing to do.
But I WOULD consider complaining if the dancer was being openly sleazy - stuff like Pirika described of encouraging tippers to touch her breasts.