Steam is naturally the only platform gamers care about because they're the only platform that acturally targers gamers, all other platforms target devs (except GOG who targets gamers that specifically want offline copies without DRM)
I can personally confirm OpenSuse is absolutely amazing, you get the advantage of bleeding edge with a reasonable amount of stability. Granted the themeing is a bit opinionated (if you love green you'll love it) but you can always change that. Also lots of amazing GUI and TUI tools, they look kinda outdated but function very well.
I personally love the story of spec ops the line, in the end you're not exactly a villain but you certainly dont feel like a hero