TL;DR: If you don’t like a show by episode 6, you’re probably not going to like it. If a show you like has had 6 or more bad episodes in a row, it’s probably past its prime and safe to quit.

Interesting read. I think episode 3 is the magic number. The first episode is actually a pilot they worked on and maybe rewrote or recut to get the actors and tone, etc. Sometimes the pilot is very different from the rest of the series. Episode 2 should be the actual tone and feel of the series but sometimes that can be difficult to get right so episode 3 is a make or break for me. By that time I should understand if I like the characters, understand motivations and something should have happened to peak my interest to keep watching. “Story of the week” or “non-serialized” shows I think are fine to check out another season episode if people are talking about it.