As a longtime Debian user, Steam can work really well on Debian, but rarely there are some things that fall between the cracks when some packages get updated. There’s also a bit of latest-and-greatest envy because Debian (even testing) is a little bit behind. If you’re only using your computer for Steam, look elsewhere. If you want a mostly reliable desktop computer and are okay with occasional hiccups, Debian is pretty awesome. Honestly, any computer you use will run into some issues eventually. If you get familiar with the Debian way of doing things, you’re gonna have a good time!