Thanks to Valve Linux is single OS on my home computer. Most of the games from my medium sized Steam library are working, and few that does not work today, will probably be fixed in the future. Need to mention that I do not play new AAA titles or multiplayer games, but I enjoy older games, and some of those are broken on modern versions of Windows.
It's really only the (crucial) segment of big, trendy multiplayer titles where support is still really hit-and-miss. If gaming is essential to your social network, Linux may not be ready for you to entirely switch over.
But if you're someone whose social hobbies lie elsewhere who enjoys solo gaming, there are way more excellent Linux games ready for you to enjoy than there is time for you to play them.