I'm really pissed after watching it. Why? Because the the show was great but after episode 16 it becomes so bad that I was considering to drop it right there.

Everyone points to the bad ending, but I started to fast-forward from episode 19 until the end, so it's actually bad even before the ending.

Let's start wit the good pars.

The acting was great, I can't complain there at all.
The comedy was really good and truly made me laugh outload.
The music fitted the show really nice with the comedy aspects and hit the mark.

Then the turning point for me was episode 17 when the show started to go downhill. (or more like falling in a hole)

Imagine a live version of twitter reenacted in a history drama, but only the gossip part of twitter, that was episode 17 for me. The first time was OK but the second... it was just stupid. And the plot started to rely on that twitter gossip... oh my... how can I describe how stupid it was. We have a saying in my country that describes episode 17 perfectly: "Your sister is a wh*re... now go and explain that you don't even have a sister".

After that we got the "eureka" moment when a specific character figured something out for no specific reason, turned evil and after 2min turned "good"... and after the moment the fast forwarding started for me and I didn't care for the show any more.

There were soo many bad things in the episodes after that, that it's hard to explain it without spoiling something.

It almost seemed that they switched the screen writer at some point, I don't understand how can the same person produce the golden 16 episodes and then sit and sh*t out the rest of them in this state.

Score:
1-16 eps - 9/10
17-20 eps - 4/10

So lets give it a 7/10.

I can't say if I can recommend it or not... it's good but brace yourself some really bad plot points in the end.