Alot of shows start off terrible, or not very good, and become great as they find their footing.
Star Trek seems to excel at this. The first season is TNG, isn't great. The first season, arguably two or DS9, barring the odd episode, aren't very good.
I found this recently with Gotham, I picked up on launch a few years back and dropped declaring it a bit pile of shit. But then, through "noise in the background", I watched it on Netflix 1-5. And it's sort of went from being a bastardization of Batman to probably my favourite comic-book show on tv. Not that it's perfect, far from it, shows like Daredevil and Jessica Jones were more consistent in quality, but when it works right it's superb.
Are there any shows in your mind that you perhaps wrote off and came back giving them a second chance?