Dilemma : dramas I had the most difficult time to rate

What a conflicting viewer experience: each of these dramas has a lot of excellent qualities but also huge issues. I was left confused and torn about what I felt about them.

Listing possible issues:

• top production quality but a chaotic scenario or editing which made the drama barely understandable
• incredible cast but disappointing characters development or unbalanced relationships
• the "drama's 2nd part disease": the first part was fantastic but the second part was total upside-down chaos, as if it was written by someone else
• pacing issues with lots of boring parts which made me put the drama on hold for some time