I don't really get how you can not understand a game. I mean video games are a form of entertainment and exists as such, even if it's not your kind of game someone else will enjoy it. There's usually at least one thing to like though.
For example, I've recently been replaying FFX and while a lot of the characters are poorly characterised (and the fact that Tidus exists in the world), 80% of the game is spent running through vast, empty fields and the story drags on and on, I do enjoy the combat system and I think Rikku is and excellent character.
Having said this, I don't understand why we need quite so many WW2 games. 2 series I can get on board with. Maybe 3 at a push. But it just seems like WW2 games from every direction. But I'm not really into FPS games, bar Half-Life, Perfect Dark and FarCry, so I guess I can't really comment.