When I first started watching drama's.. about 4 1/2 years now.. I mainly would pick and choose based on summaries.. I have completed at least 140 drama's(I am sure there are more but I haven't updated my list in a bit).. out of those there maybe 5 or 6 that I definitely should have dropped (BOF, HYD, PK, etc), but I would feel I have to keep watching, cause I already watched so many episodes, I need to finish it. But, as time passed I decided screw that, if I truly get tired, bored, or really any negative emotion about a drama I will drop it... I have 10 dropped drama's, and most of those had been dropped by episode 3 or 4.. there are a couple that I watched more of, but got so beyond tired/bored with that I dropped, such as Love Buffet. I think in time, most of my On Hold list may end up on my dropped, because, if I have to put it on hold, something was seriously bugging me at that time.
I am at a point now where, more than the drama's themselves boring me, I have a hard time finding drama's to watch, thats why all drama's that are recommended to me, I check out, but I still have a hard time... like 3 of the 4 currently watching drama's are all airing right now.. the 4th I am about to drop.. I guess more than a dropping funk, I am in a drama funk, but I still prefer it to American tv..