Even if the majority of AoE2 userbase was from Argentina, I can assure you most Argie gamers don't play the game (most are too young to even know of it) and so it's not "big" in Argentina.
In that sense it wouldn't be big practically in most countries but I think OP refers to it that it enjoyed a huge popularity back then and now with AOE DE people (probably of the age bracket that played it back then) do absolutely play it in large numbers.
