It's not huge showstoppers. It's just a lot of little annoying things and last mile configurations. For example, I have to launch KCD2 with a Steam Deck related launch option for it to pick up my controller. It took a bunch of googling to figure that out.

I have an Audeze Maxwell headset whose dongle was left in Xbox mode (which Windows was happy with) and so I spent 30 minutes debugging why it wasn't working in Linux until I flipped it to PC mode - which crashed PulseAudio so I had to restart it.

Dota2 has a native Linux client... but it suffers from microstuttering and that's just killing me. FPS is high as I have a 4080 but, man, the stutters are killing me.

Battlebit initially launched in a resolution so low that I had to guess through game menus to get it to my monitors native resolutions. It's just... small and annoying things.

I don't really mind, personally. I grew up using Linux. I don't mind doing these configurations and it's worth it to have a dev environment on my desktop computer. It's just that Linux isn't really "Microsoft competitor" ready when it comes to gaming. Valve has put in a bunch of hard work though. Huge kudos to Valve for getting Linux as far as its come. I hope the Steam Machine takes off and we see more hardware and game developer support.