When I created my latest top 10 Korean Dramas, the first thing I did was list down all of the shows that affected me in a way that it left a great deal of impression in me. Then I narrowed it down, rearranged some of it then my list was complete. All in all I wrote down 26 dramas.
At first, I didn't want to arrange it based on my preference but as I thought about it more, I came to a decision to group it: (i) for popular but I didn't like so much, (ii) the middle, and (iii) ones that almost made it to my top ten.
The reason for splitting it to three groups because I know people who truly enjoyed those drama. I did too but it really wouldn't make it to my top dramas. That's why it's noteworthy.