Are you explicitly looking for competitive multiplayer games? Single player shooters like Prey, or the BioShock games, might be able to fulfill what you’re looking for. I like Helldivers 2, as well. It’s not slow per se, but your fighting AI and not people so insane reflexes are far from important. It’s coop but very worth your time.

Garuda is more user friendly than most arch distros, but you really might want to consider something like bazzite. You can always change the desktop environment and theme as much as you want regardless of distro, although if you’re looking for a Windows -like experience I recommend KDE with it’s default settings.