Dota 2 is the most-played PC game in the West, according to a report by DFC Intelligence (via GamesIndustry International). The multiplayer online battle arena surpassed League of Legends for North American and European hours played for the first time in 2013's first quarter, according to DFC's PC Game Meter service.
Keep in mind that the metric does not cover Asia--with just China added to the equation, League of Legends trounces Dota 2 as core-PC-gaming champion. Fortunately, the MOBA market appears to be growing instead of cannibalizing itself:
"Usage of League of Legends has been steady the past year and surprisingly the huge success of Dota 2 did not seem to cut into its popularity as much as would be expected," DFC analyst Jeremy Miller said.
Dota 2 is still technically in closed beta (though most Steam users could paper their profiles with spare invites). We can't wait to see the sparks fly between these MOBA powerhouses once it releases in full.