Okay, here's the thing: Goblin was a drama sooooooo many people loved. It was said to be such a great drama. It took me really long to watch it, simply because I am an anti-hype girl. I never read or watch things while they are being hyped, as I don't want my view to be somehow clouded.
But then at some point, I'll probably watch or read it nevertheless. That's how it was with Goblin. And I honestly looked forward to it because it was supposed to be such a great drama. Boy, was I wrong. Here's why.

Story:
The story is basically a great idea! A Goblin who needs his bride to be redeemed. His bride being a High School girl, that he once saved, who sees ghosts. Wait, what?! An ancient guy and a High School girl? Oooooookay....I thought, well, maybe they just meet once while she's in High School and then they meet years later to fall in love. Well, no. That's not what happens. The story is reaaaaaaallllllyyyyyy slow paced and with that at some point it was just dragging on and on and on and on and I thought  "MOVE! FORWARD!" But that did not happen until the last two or so episodes. Meeh -.-  
The only thing that made this slow story better is the story line between the Grim Reaper and Sunny. I would have loved to have THEM as the main couple and tell THEIR story rather than the Goblin's story.

Acting/Cast:
I haven't watched any drama with Gong Yoo or Lee Dong Wook before, wo I was open to anything that might come along the way. They both acted fantastically but I was just SO IRRITATED with Gong Yoo's role. He was constantly going on my nerves acting like a spoiled little child. Some scenes, especially in the beginning were really funny and I got some weird glances from my husband because I burst out in laughter several times. But after some time the Goblin became really annoying.
The Grim Reaper on the other hand had a lot of depth and he was a fascinating character through and through.
Now on to the girls, I watched Kim Go Eun in "Cheese in the Trap" and Yoo In Na in "My love from another star" and I liked both of them. Here they also did a pretty alright job. But due to this slow paced story I couldn't enjoy there acting much.
A huge praise goes to Yook Sung Jae, he was hilarious and so damn cute!
Also, I would have loved to see more scenes with Kim So Hyun and Kim Min Jae - THEY LOOK SO FREAKING GOOD TOGETHER! Can they please get a drama where they are the OTP!?!?

Music:
Now that's the amazing part of the drama - the music. Alsways spot on and so so beautiful! Together with the scenery - WOW!

Rewatch Value:
I would give a 0 if I could. Will never rewatch this.

Overall:
It could have been amazing! Unfortunately it wasn't. Not at all.