I wouldn't call myself a hardcore gamer. Only play on weekends and almost exclusively SP games. But so far experience is great (Pop OS, NVIDIA GPU, medium tier gaming laptop). Steam games are mostly playable without serious issues (adding some launch parameters or choosing certain Proton version might be advisable for certain games). Emulation also works nice (tried PPSSPP, RPCS3, Yuzu, Cemu). I would say that gaming on Linux is fine, unless you really need to play one of the not fully supported titles (especially ones with those pesky anti-cheats). Couldn't care less about RTX or HDR (would not work well even on Windows with my rig).