Really well. I’ve been playing Cyberpunk 2077 in Linux on my PC without issue, and plenty of other games on it, my Steam Deck and now a living room mini PC.
A combination of steam (and Proton), Wine and Heroic launcher (for GOG, Epic and toeht stores), plus tech like Vulkan, makes most PC gaming viable in Linux.
There remain some games that don’t work but generally they get tweaked into working with a newer version of Proton. Windows-reliant anticheat software seems to be an issue though if you like competitive fps type games.