Good :

i) One of the best background scores ever, not just in Kdrama but could stand out in UK US dramas too. Background music will certainly stand out
ii) Best chasing scene in Kdrama and can fit into most top level action movies in Hollywood...

Bad :

i) Storyline which gets nowhere after episode 4 or 5.
ii) Stereotyping Muslims , border line offsensive

Ugly :
i) FL character (not the actress), drags the whole series down. No redeeming arc. She cries in episode 1, she cries once in all episodes. She cries in end too. One of the dead characters ever written. For lack of story movement said above, her part drags this down to mud.

Summary :
i) Overall great technical expertise in making the series but awful story, character development means this is 5/10