This is why some shows fail the instant gratification that some people want rather than waiting for a pay off later.
It's still not a question about instant gratification. It's more about "I don't like this story, I'm glad the next episode will have nothing to do with it" for a show that's not serialized. You don't get that luxury otherwise. In a serialized format, you're stuck with the same story, like it or not, where the pay off might not even matter by the time you eventually get to it.
For episodic shows, unless it's something like Twilight Zone, the story will be different but the characters will be the same, and generally the formula will also be the same. You could say "I don't like any of these people, I don't care for this formula, what do I care what adventures they'll have next?" Or "If the writers are this bad, why should I trust them to do a good job next episode?"
I would give up on an episodic show I wasn't enjoying a lot faster than a serial show I wasn't enjoying, because I know episodic shows tend to repeat formulas and serial shows build to something. Especially if I have friends whose opinions I trust in my ear telling me to stick with it.
I definitely agree that serialized shows add more variety and depth to their characters by having self contained stories in the middle. Just like Sopranos had that episode about the rap producer trying to take back money from Hesh.