Think of your favorite show. Now think of it's absolute worst episodes. If you had to sell someone on your favorite show using only it's absolute weakest moments, do you think anyone would want to watch it?
I'm watching a video about DS9, and they're going over the weakest episodes and I'd forgotten just how routinely that show had absolute dog shit episodes. So I started going through all my favorite series, some of them have entire fucking seasons I'd write off.