I rarely drop television shows, and usually when I do, it's either because of terrible scheduling or because I'm just too lazy to finish it (which is especially true with anime). Here's a few I have dropped though:
- Naruto: Too much filler episodes, which led me to following the manga instead
- My Little Pony: Friendship is Magic: Lost interest after Season 5 ended, now consider myself a former Brony.
- Agents of Shield: Didn't find the series too great in the first season, though I heard it gets better afterwards
- Steven Universe and Rick and Morty: Terrible fanbases made the shows harder to watch. The former was also due to my parents not liking the show because it had LGBT characters and they didn't get the appeal, while the latter I felt dropped in quality in it's third season, save for a few episodes here and there I found enjoyable.