Codww2 isn't built as a competitive game. Devs have said time and time again that ww2 is just a setting. It's not a ww2 game, it's a competitive shooter set in ww2. Cod2 Vs COD4 promod has also been used alot. Don't get hung up on one thing. The sounds and maps etc are pretty authentic. If you are after authenticity then I advise arma or squad. A 5v5 competitive FPS will never have authenticity. Simple, it's just not fun to watch as an esport or play and I'm coming from a person who loves squad, backed squad and loves arma!