I'll start with what I liked:
-the kisses. Let's call them for what they were, "fire"! After watching multiple shows with open-eyed, slack arms, dead fish kisses, these were exactly on point. These are the scenes that I rewatched, and the only reason I actually gave this a rating of 5.
-the acting was good, for what it was. I loved Park Gu Young in Dali and the Cocky Prince, and I liked her in this as well, though I didn't really love her character that much. When she kept trying to get him drunk (I'm so tired of drunk scenes), I found her to be irritating. Cha Eun Woo was basically like he's been in everything I've seen him in. Quiet whispery voice, serious. You could play this show and True Beauty side by side and get what I mean. Everyone else did an okay job.
-family and friendships
-happy ending

Then the stuff that I didn't like.
-Thankfully, I waited for all the episodes to be released before I tried watching this. If I hadn't, I would have given up early on. I think the programmers did a disservice to this show by making it so long to be finished, between an episode once a week, to pre-empted episodes. That being said, this show was entirely TOOOOO long and very repetitive. My Viki showed it as having episodes 0-15. Episode 0 and episode 15 were the same, basically a recap of what the show was about. After watching episode 0, I kept having feelings of Deja vu while watching episodes 1-4. Then there was the recap at the beginning of every episode, and the mini recaps throughout to remind us of what has been going on.
-This show shifted and lost its footing halfway through. Started out as a comedy, with the potential to be cute and quirky. Then it shifted to bullying and its effects, then it went to revenge melodrama with the mountain god. It should have been either a comedy or a melodrama but should not have tried to mix the two. I don't think it was successful.
-The whole mountain god storyline was completely unnecessary. It seemed so over the top melo after watching funny scenes. This storyline took up a lot of screen time, and I didn't enjoy it, especially since he had cursed this family and done terrible things and there were no consequences for him. That REALLY irritated me!
-This scene really stuck out to me, and I had a hard time getting past it - whenever the woman turns into a dog, her clothes drop and she has to have friends get her clothes to her because she's naked when she turns human again. In the scene where he kisses her and lifts the curse, she turns human and is completely dressed. Why?! This would have been a great opportunity to throw in some comedy by having her be naked as usual.

Normally, if I like a show less than others, I'm usually in the minority and say give it a try, you might like it. I have reservations here, unless you make the FF button your friend. I can't remember the last time I watched a show that was so repetitive.