This series deserves way more praise.

In a world of fantasy, adventurers gather to defeat monsters, a young priestess takes her first job slaying Goblins, however the quest goes horribly wrong when her companions get murdered and violated by the goblin hordes, before she ends up dead herself, a man clad in iron armour with minimal weapons and specific strategic items slays every last goblin with extreme prejudice, he is the Goblin Slayer, driven by a past event that's haunted him, Goblin Slayer kills all goblins no matter the situation. Joined by Priestess, High Elf Archer, Dwarf Shaman and Lizard Priest, the objective remains clear. Slay Goblins.
Right from episode 1 you realise very quickly that this is going to be brutal to watch, they make it very clear that Goblins have no moral compass and treats them as the ultimate evil despite the fact that on a grander scale they are starter monsters, having that black and white morality makes it easier to support the heroes in their quests especially when they have to really show how horrendous the crimes the goblins commit are, there is no grey and that simplicity makes this show compelling to watch.
Goblin Slayer actually feels like a proper dark fantasy on the level not seen since Berserk, and like Berserk it pulls no punches when it comes to harsh realities, the dub equally backs up this sentiment.
Final Verdict: Goblin Slayer is one of the best examples of dark fantasy and very simple to pick up and watch, very close to being a top ten anime.