I definitely don't always finish a show. I try to give it 2-3 episodes to see if I can get into it, but if I'm not enjoying it...I'm done. Occasionally, I only make it through one, or part of one, episode, and know it's not for me. This week, I started Designated Survivor, and dumped it after four episodes.
Even for shows that I've been enjoying, I often get TV ADD and forget to go back and finish a series, like Schitt's Creek - which I keep meaning to go back to some day.
I actually dropped that at one point, then picked it back up later and ended up loving it again.
To answer the original question - no, I don't always finish shows. I find I get bored of comedies more than dramas, I think because the episodes tend to be more self-contained and I miss the "what happens next week?" factor. But I've also dropped shows for specific reasons (like Outlander got too violent for me, or I hated the evil cop on House).
I figure there are too many shows out there to settle for ones you don't like.
(It's true of books as well, but I'm a work in progress on that one. I still find there is a little guilt factor to not finishing a book that just isn't there with TV. But I'm working on it!)
I agree that there are too many shows out there to keep the ones you don't like or want. It seems like I delete more than I keep, but it's fun checking out the variety online.
I definitely don't always finish a show. I try to give it 2-3 episodes to see if I can get into it, but if I'm not enjoying it...I'm done. Occasionally, I only make it through one, or part of one, episode, and know it's not for me. This week, I started Designated Survivor, and dumped it after four episodes.