I never got the “There Episodes Rule” of the anime community. The “logic” behind this rule is that you should give a series three episodes to see if it gets good, or worthy enough to continue.
I personally believe that a show should be good and make a great impression on the first episode. The first episode should at least have a few things in it that should match your taste so you don’t have to wait for a show to get good.
If I don’t think a show is good on the first episode, I ain’t gonna waste my time on the series. I have way too many shows on my backlog to get through to worry about shows I’m gonna dropped of the first episode.
Pic related: Attack on Titan, a show I wasted nine episodes on waiting for it to get good lol.