Honestly, between Steam and Wine, there's a large number of games that play just fine on Linux. Not as many as on Windows, of course, but if I ever had to give up Windows on my main desktop, I don't think I'd have any trouble staying entertained.
On topic, 2 of my favorites would 'The Last of Us' on consoles and 'Endless Legend' on PC. Both are fantastic games in different ways. Also, I'm with Frags in singing Mario Kart 8's praises- it's an excellent game by pretty much any metric.
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