But that’s a legitimate reason for it to exist. A lot of people have reservations towards Linux because they’re concerned about the gaming experience. Making it smooth and easy is a good thing. Having said that, I just installed Steam on Mint and everything ran just fine. I only play Steam games on that machine, though.
Mint is great and an excellent choice. I’d give it a shot. If it doesn’t run well, you can always try something more lightweight.