I read through every post in this thread and learned that pretty much everyone can agree that OUAT is garbage haha. I've never tried it, and probably never will. It looked like a not-so-good version of Fables.
The most recent show I dropped was Orange is the New Black after 2 seasons. I hate every character in that show.
I dropped Girl Meets World 6 or 7 episodes in. I felt like I enjoyed it a little at first, and then I just really didn't. It didn't have the same magic.
I dropped The Walking Dead because I'm that guy that draws way to many comparisons and contrasts between the show and the comics. Other than Daryl, there just really is much left for me to enjoy in the show sadly. I stopped in the middle of season 5 or 6, I don't remember.
I dropped Shuffle! after 8 or so episodes. That anime just sucked in my opinion.
I dropped Attack on Titan after 9 or 10 episodes because my friend finished it before me and was so disappointed with the ending (because you know, there isn't one yet).
I could probably go on and on about dropped anime honestly, so I won't. For the most part with tv shows, I stick with them for the long haul though unless I watch like, one episode and hate it.