Hi,
Update August 2022:
I have just finished watching Love Like The Galaxy and I have given it a solid 10/10.
I haven't really visited MyDramaList site since Healer back in 2016 but I have been consistently watching dramas from many countries. over the years.
LLTG had me so engrossed that I couldn't even watch any other drama. This is now my all time favourite drama.
I am of Korean heritage and so I've watched a fair number of Kdramas over the years. However, my true addiction to Kdrama began after watching "City Hunter" in 2012.
How I rate dramas is mostly subjective (i.e. how much I enjoyed the drama) but I do take into consideration the overall quality of the drama (i.e. acting, writing, directing and editing). I often can't get into a drama simply because I am just not in the mood for it and sometimes I would try it again and end up liking it. There are many dramas that I've rated high which are not the best writing/directing/acting but for whatever reason I simply liked them a lot.
My rating system:
10/10 - loved it, was blown away by it, memorable, high quality writing/directing/acting, offered something different.
9/10 - loved it, highly enjoyable to watch, good quality writing/directing/acting, offered something different.
8/10 - thoroughly enjoyed it, good quality writing/directing/acting.
7/10 - enjoyed it and with no draggy parts.
6/10 - enjoyed it but with some draggy parts.
5/10 - watched it because it was entertaining enough.
4/10 - watched it but wished I hadn't.