I recently watched HBO’s The Time Travelers Wife full well knowing there was only one season. I think I mostly regret it. I loved the show, and knowing there won’t be any more to watch has bummed me out for the past week. I can’t remember feeling this way about any other show - it sucks.
This was exactly what I thought of with this question
The first episode or two, jk Simmons and Sissy Spacek were the only reason I kept watching (they’re great). But by the end, I was completely invested in the story, which they will never finish.