Please keep in mind that i have not finished the whole series, 2 more episodes to go, but of course everyone has their own opinions. So, i'm just here to help you decide whether or not to watch.
Honestly, I personally expected much more from this drama, overall i wouldn't say it's very bad, but the plot was just too boring, they call Habaek the water god but so far he has only portrayed his abilities twice, so it honestly feels like he doesn't have much, as in you can't really see his godliness. I expected when he went back to the god world and came back to the human world again he might have his abilities, but the drama still continued on with him without his abilities, and i would say the drama has far too much kiss scenes with no feel/emotions to it, yes it is passionate, but it just feels forced, which led to people thinking that their chemistry looks fake/forced.
I would say that the drama should have lived up to its genre "fantasy", but sadly, it did not, it was more like romcom, which was sad because i really wanted to watch a fantasy drama.
As a tvN production fan, this was definitely not my favourite. But then again, as i have said, everyone has their own opinions, i hope this has help you decide whether or not to watch it.