A lot of people who have had hands on experience with the game thus far (certain modders, City Planner Plays, Biffa, etc) have made note of its terrible performance, even top of the line rigs with 1500 dollar video cards.
Like, 15-20fps levels of performance on top tier cards.
Granted, that's on high settings.. but its a freaking city building game, not a AAA hyper realism ray traced first person VR experience. It shouldn't require a nuclear power plant to play a city builder!
And you shouldn't have to run the game on low settings just to get a playable framerate with a decent rig, modern rig.
That, and the lack of workshop support? I mean, I get them wanting to host it themselves, but that just means it'll be alive only for as long as they want to host it, vs steam which the workshop will be there until valve goes out of business.. and I'd wager CO goes under long before steam does.
I was excited for CS2.
But these two bits have really pushed the game off the shelf for me into that "Well, Maybe I'll buy it in a year or 2 when its on sale for 5-10 bucks" territory.