It is no doubt that this drama is a masterpiece but it isn't for everyone.

If you expect a full on medical drama or if you don't like heavy toned dramas with themes like Power struggle, then this isn't for you.

The story isn't very original but it is solid. It is slow, yes, but slow doesn't necessary mean bad. They do not rush through the story and they know when to give it progress and some 'action' to not bore the audience.
It's very dialogue heavy drama and not very light it does have it light moment, so that you're able to breathe or have a little laugh.
There isn't really any romance in this show, some people like that, others don't. I myself aren't really a big fan of romance in dramas because I feel that they always go the through the same route. I don't mind some subtle romance or hints of it. Or even actual romance, if they do it really well. This show go for the subtle romance and it fits this story really well, so I'm happy they didn't go full out with it.

One of the best thing in this show was the acting, everyone did a great job and almost every character was in the grey zone and not one-dimensional. No one of the main characters or 'the good guys' were perfect or 'pure' and that gave a very realistic tone the show which is very important in these kind of shows. Every action the characters made, did make sense.
Some characters do work better than others but it isn't the acting that's the problem but rather the characters themselves and it didn't really bother me to much, but can be worth mentioning at least.

Like some of the other reviews has said, the worst thing in the show is probably the music. And it isn't even bad, just that nothing really stands out, the intro music is probably the soundtrack that stands out the most. This doesn't have to a bad thing as well. It just means that the music does what it supposed to, but it might not be something you would listen to on it's own outside of the show.

As for rewatch value, it always go down a bit after you seen a show since nothing it new anymore, but you could certainly watch this again and enjoy it to it's full potential since it isn't a mystery you have to solve. You know the characters motives and there isn't any big plot twist that would ruin the fun in rewatching the show.