I know it's another detail (I feel maybe a bit excessive with details, but I've been waiting too long for a new addictive hack'n'slash experience since D2)...
Three thousands years ago, Greece had a more temperate climate and would't have shown this semi-desertical look. It was greener, by far.
But, yes, it's a game, not an historical reconstitution
By the way, I hope I won't see too much swords, since greeks and romans didn't have really (I mean blades with two sharp sides).
Ok ok, Sune, stop trolling this way