I think it very much depends on what games you're looking to play, but I've been having a wonderful experience ever since I fully switched to Linux earlier this year.

I'm currently on Kubuntu and for games I'm using Steam, Heroic Games Launcher (GOG & Epic Games), and Lutris (Battle.net).

My experience with Steam has been pretty much flawless, Heroic Games Launcher was fairly straightforward to setup, and Lutris was pretty easy as well -- mostly took some extra time due to bad reading on my part.

I mostly play singleplayer games (e.g. Baldur's Gate III, W40K: Rogue Trader), with the occassional multiplayer game thrown in there (e.g., The Planet Crafter, Guild Wars 2). So far, I've had no issues besides having to install Proton-GE in favor of Steam's Proton layer due to some iffy cinematics in games, but that seems to be par for the course when following many guides online.

The main games that don't seem to work are those that require kernel-level anti-cheat, think PUBG or the upcoming Battlefield. Which is unfortunate, but I can personally live without. ProtonDB is an excellent website to check out before you make your switch, so that you can see which games won't work.