League of Legends is the most played PC game of and not Dota 2.
League of Legends sees “over 500,000 peak concurrent players every day on just the EU West shard.” Note that Dota 2′s highest ever concurrent player count, according to SteamGraph, is 325,897 users worldwide.
"The past year has seen numerous blockbuster PC games that have really helped drive usage. This includes among others Diablo III, Guild Wars 2, Battlefield 3, Minecraft, World of Tanks and Valve's Counter-Strike series," added DFC analyst David Cole.
"We have this service that tracks usage of PC games. League of Legends is always on top by a huge margin, an order of magnitude. The only time anything came close was the launch of Diablo III, but just for a short time. Dota 2 showed a huge bump in usage; first product to do that well in a long time," said Cole in a statement to GamesIndustry International.
"The thing is globally [League of Legends] is still much bigger because we don't track Asia and many of the small markets they have penetrated. Our tracking is only key Western markets. China alone counts for way more usage of [League of Legends] than the rest of the world, so that is the major footnote we have been telling everyone," he added. "The main news to me was that Dota 2 has been a huge success."