Coincidentally, the League of Legends world championship final is occurring tonight. Anything you learn about the genre or strategy will apply somewhat to any game in the MOBA (multiplayer online battle arena) genre, so check it out if you're interested in learning more. Riot Games has hired an entire team of casters and analysts, and I find the commentary to be mostly insightful and enjoyable compared to American sportscasters.
To bring this on-topic: I wonder whether Valve will allow non-Steam games to run on SteamOS. League of Legends is directly competitive with Valve's own DOTA2, but Valve has historically allowed you to use Steam purely as a launcher. My biggest fear is that this is yet another walled garden, just one that has embraced its digital nature sooner and better.