@Christopher
People are scared to pick numbers below 8, and I think it's the journalists' fault: they seldom give AAA games/movies a bad rating, due to those studios financing the journos.
In reality, these items are way below 8/10, but nobody dares to say so.
In case of manga, I think only the small amount of MangaDex readers' opinion is the cause: there's ~300 votes for this series. If this were MAL, they would drag its ass through the mud, but because there isn't many people who would even click on this (due to it being a 4/10 just by the cover..), it gets high scores.
(just checked: on MAL,this trash doesn't even has enough votes to have a score,lol...)
@lleris
The 7 day lifespan would mean that there should be mountains of goblin corpses in this world..a whole ass goblinocaust, that's what it is.
Kumo desu ga was all about the grind, and every upgrade felt earned. This? "lol,here's some random-ass skill from ded goblin".Due to them dying like flies (even worse, house flies live up to 15-30 days..), it gives a "reason" for the MC to have what, 300+ skills later on...
Even Slime had a better grind (even though I would say it's still cheat-y, Rimuru is OP in the first few chapters already...), but this is just bad writing.