It seems it is a trend nowadays to have good cast/actors but not a good drama. In MD, the FL seems to be the reason it is popular. She is popular and indeed she acted good. The acting (of the rest of the cast including the ML) is less than satisfactory. The comedy part is wanting.
One area that noticeable in dramas (K or C drama) is directors have difficulty in the love story part. It is more often at best cliche; at worst stupid. Only a few dramas where directors got it right.
Just like the earlier commenter, it started good. Then it went astray...
But if you like the FL (like me) - then its ok to finish the drama.