I dropped Personal Taste at 4 eps, not because I didn't like it but I dunno, perhaps I got bored, I also dropped city hunter at episode or 3. I need to watch those.
I also dropped Athena back in August and now I'm trying to get back into it, I'm on ep 6 as of now, still missing 14 gosh sounds like a lot, but like..it kinda bores me from time to time (maybe cos I was watching secret at the same time) and I ended up dropping Operation Proposal on ep 2 but that was cos I started watching Iris.
I remember the only drama I've finished out of the few I dropped was Fugitive: Plan B, I always got to ep 4 and then used to drop it, even if it was good, I dunno why, but luckily earlier this year I watched it and IT WAS SO GOOD, I loved Rain