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.
The way I approach it is that you have to mentally prepare and then just “spin your own head cannon” of how it would have wrapped up. That can be better than if a show went on for too long past the main storyline, or the main storyline wrapping up disappointingly. You just have to learn to accept that some awesome stories won’t be finished.
So overall for me it’s not that important for decision to watch or not.