I believe people enjoy the light comedy and simple humor of the situation and characters. I had someone email recently about the character of Heather, who might be considered the one with the least amount of depth. But there is more than meets the eye in this "simple" character.
When someone asked about the character of Heather (by an actor portraying her), I gave this reply:
"You described Heather well... ditzy and wants to have fun.
But she is also very positive and wants to try and help Brenda look at the brighter side of life. Even though Brenda seems annoyed with her, Heather does help her have fun and look at things in a more positive way.
Heather does tries to see the best in people, but she's also a bit gullible. She also is a sharing person, who is not greedy. Of the people in the play, she is probably the kindest person. She has a good heart and is the most innocent (least corrupted by the world). Despite any problems around her, she keeps a good outlook on things."
So comedies don't always have to be fluff. Characters can have depth and be interesting beyond their appearance on the surface.
