I was taking about this engine just earlier too, in another thread. Unreal Engine 3 is very very real, but opposing their name. Such as Serious Sam who is unserious. Unreal Engine 3 has real-time physics, sounds and gameplay, but it isn't perfect ever since I saw Brothers in Arms: Hell's Highway, where a soldier's uniform is trianglish. In the near future, where there is Unreal Engine 3.5 or 4, they will be completely realistic by oppinion.