Yeah, I take for granted a certain Euro-centric perspective on some things.
Having said that, I think our own Marines' struggles in Mosul back in the day rank up there with anything the Russians had in their counterinsurgencies. Arguably worse because of certain USian ROEs that the Russians don't really have.
But, that's not really to argue against your assertion. At a certain point, marginal increases in comparative hellishness become trivial.
The Chechens would get into a building, frag the top floor so a helo couldn't land, get the ground troops in and detonate the bottom floor to then start fighting through the floors, ceilings, and walls...I've got that here somewhere...