I don’t have a huge game library so my experience is limited, but I’ve had no issues gaming on Mint. Some of my regularly played games include Deep Rock Galactic, Risk of Rain 2, Lethal Company, Astroneer, Elite Dangerous, and Sea of Thieves.
I bought an ancient PC game I used to play as a kid called Summoner, and even that started right up.
I host a handful of Internet facing sites/applications from my NAS and have had no issues. Just make sure you know how to configure your firewall correctly and you’ll be fine.