Looks like De'Arnise Keep, Level 1.
Yeah if you remove anything remotely interesting from the first level of De´Arnise Keep you will end up with something similar to this.
No, it looks like every single fight in De'Arnise Keep, Level 1.
Encounter design sucks in POE, as I and everybody else has said a million times. The reason it sucks
isn't that
a single level that is meant to be populated by trolls and slimes has trolls and slimes in it.
There is no enemy type in POE that occurs "hundreds of times" as might be moaned. How many places do you find trolls, for example? You find about ten in that level above. You find less than ten, I think, in Cilaban Rilag. Then there's a few extra scattered here and there.
Even shadows and skeletons, the ye olde copypasta enemies, are of a decent number spread out over many places. (There's less than 20 shadows in Eothas Temple, and less than 30 undead under the Keep.)
A similar "OMG look at trash mobs" picture can easily be constructed from literally every IE game (including PST), both Fallouts, Arcanum, and so on. And no, not just the Xvart Village: the Gnome Stronghold, the Bandit Village, the Nashkel Mines, the Firewine Bridge, the Werewolf Island, De'Arnise Keep Level 1...
It is also going to be accentuated in Od Nua because the maps are broken up into smaller pieces to complete the stretch goal. Ideally, without the stretch goal / KS business, we could have had it in 5-6 levels. This is basically what it looks like when you cut Firkraag's Dungeon into 8 instead of 2 levels.
The real reason encounter design sucks is (1) the lack of hard immunities and active battlefield-changing abilities by many creatures, making them 'softly' different but not radically different enough from each other; (2) the lack of Wizard Battles; (3) the lack of enemies loaded up with a better selection of abilities.
Part of this could have been mitigated, indeed, if some of those troll/slime encounters above were replaced with, say, adventuring parties. To me, though, it makes a lot of sense that that level contains an ecology of mostly trolls and slimes - they just needed to make those trolls and slimes more interesting to fight. Not that, say, BG1 did that, but that's no excuse in the end.