While I will heartily agree with four items on the list of elements of bad drama, I must protest the ban on excess profanity. There exists in this world a certain class which pollutes their speech with many expletives. If one is attempting to represent this group at all, the various vulgar expressions must be used or all appearances of realism are lost.

The problems are avoided if there is at least one character (preferably the more intelligent one) who doesn't swear at all. Then it becomes clear that the profanity is simply a characterization tool (and a rather effective one, in my mind).