1, The pun is the lowest form of humor. It is also one of the oldest devices used in literature. Is our humor too sophisticated today for use of the lowly pun?
2, No. there are good puns and bad puns, although sometimes the bad puns are good and vice versa. They can make an audience laugh and applaud, or groan and moan.
3, One of television’s better and smarter programs, Cheers, occasionally uses puns to promote plot and character and to get laughs. And they get big ones. In one episode, Ted Danson (Sam) asked Shelley Long (Diane) how things were going with her in the romance department. She answered, My love life is stable, and yours belongs in one.”