I used to like The Bill (https://en.wikipedia.org/wiki/The_Bill), back when it had 30-minute episodes, each of which was in effect a self-contained little play using the same set of main characters. The episodes were written by different people, who were credited quite prominently at the start, so the quality of the writing varied, but in a way that made it more interesting. Unfortunately, more recently, that's not what the market wanted, apparently.