I liked it once I got past the absolutely atrociously bad first episode. But not because of the whole "kill all goblins" shit.

The thing that makes it good is the DnD party style combat, where combat is genuinely high-risk, the combatants all have reasonably down to earth skills/abilities, and they could all easily die with one mistake made. The combat itself is extremely DnD-like, in particular with the kinds of DnD parties that invent cheese methods of beating encounters. For example this Beholder fight scene is VERY DnD party in style.

I think there is a real audience for combat encounters written and played out in this way, and that anything would be popular without the whole genocide-the-goblins narrative if anything else were like this. A lot of combat in anime is just whoever screams loudest or whoever has the highest power-level instead of intelligent application of the powers to a scenario. You could see this exact scene play out in a BG3 encounter or group tabletop game and it rocks.