Well, I've played a lot of Dawn of War, Total War and Civilisation: Revolution (In which I followed the policy of 'the fuck is diplomacy?'), so that's a few dozen continents worth of people.
Then there's every CoD/Battlefield/Generic Brown Shooter game I've played, plus Borderlands 1&2 and all the Halos.
And Final Fantasy 7,8,10,1-2,12 and 13 pushes it up higher.
Then, onto RPGs. Demon's Souls, Oblivion (+both expansions), Skyrim, Deus Ex: HR, Prototype, Fallout 3, FO:NV, Fable 2/3, Dragon Age: Origins/2...
I've probably committed apocalyptic genocide a few dozen times over.
And I liked it.