ok so let me make one thing clear. Although yes there are many elements that are similar to Re:monster in the beginning of Goblin Kingdom (Goblin no Oukoku) it is definitely not the same.
Firstly lots of harem + OP elements + very shonen-esque = Re:monster. But Goblin Kingdom is filled with action, drama, depth of characters, even has a psychological aspect to it. This is more likened to Kingdom or Legend of Arslan.
People who are to trying to get a feel for this series should read at least up to chapter 35-40 to get a good feel for it. Also protagonist actually is a believable one hes not super OP. There is even a point where he loses. That in itself shows the difference from this and Re:monster.
Secondly, I do this a lot but don't just trust reviews or the votes on the ratings because the issue with that is that it is could be an opinion of a group of people who are not the target of the series so I tend to ignore those and judge for myself if the series is good or not. This is why cult culture exists for movies, tv-shows and etc.
Finally, I usually don't tend to give out my opinion on most of the things I read mainly because I find it tedious and frankly I don't really mind if others miss out on something that I like to read but this series I have to say is good especially when an awesome line like:
"I rebel; therefore I am" shows itself in the series.
I do have to admit that there are typos and sometimes the author has made mistakes within the novel but they are not so great that they influence the book/story. Hopefully this helps those who tend to follow reviews
p.s. Hats off to the translation group/person Neo Translations. Yes although there are some typos the fact that the story flows well especially in english brings my heart joy because there are so many translations of other novels/manga that I have to self edit as I am reading along to actually get a sense of what's actually happening in the story so thank you Neo Translations.