I think I watched it for the first time about 3 to 4 years ago. For someone who watched this drama as their very first experience, I can say that it's not that bad at all. Even after I watch it for the third times, I'll still say the same. And I’m glad I watched it as an introduction without relying on the reviews.

U think the plot is confusing? Personally, I did think that the plot is kinda confusing for people who don't like mystery as much. But for me, it's exciting because the drama won't bored me out.

The beauty of most of the cast members, especially Nam Joo Hyuk himself (I really love the way he looks and his style perfectly) definitely can become point plus for people who find the drama kinda lacking.

Conclusion :
Just try watching it first without relying on other people's reviews and watch it with pure enjoyment without giving it high expectations either. Who knows, maybe you might end up liking it.