^ Are they OP, are just unbalanced in a way that the AI plays them in a very "game-y" manner?
The Dwarves are just

annoying. If they are in the game then you spend an inordinate amount of time taking back locations from them. Theuy spawn obscene numbers of small 'explorer' stacks that go out looking for mines. And they are invariably the last enemy left and you have to hunt all over the map to find the last Dvala. At which point she has 30+ Dwarven Ballista in the mine with her. I

hate them. Ruins the game for me.
The Bakamono can build stacks of these Kono troops that cast spells and ripe you apart. The computer player is pretty good at summoning the troops and making big stacks of them with support and once it gets one or two of those the game is over unless you have something bigger and more OP.
I also don't use the Scourge Lords as the computer player really leans in on the ants and those are almost impossible to stop.