I hear it is a popular game and I am obsessed with the history of hitler and the ww2.

No, the medal of honor series is more WW2 based
Medal of Honor (series) - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Medal_of_Honor_%28series%29)

Red Orchestra and Red Orchestra 2 are excellent WWII games. The battle scenarios are all based on real locations from WWII. It is only PC based gaming and is best when played online through multiplayer. Some like it, as I do, but others like COD and the other more popular games better for online play as RO and RO2 is just a little too realistic in that there are no aiming crosshairs on screen, teamworks helps you win, and it's not just a run and gun game.

No.. there is nothing similarity between call of duty and WW II game except the war. Call of Duty is much better. The graphics and storyline is far better.

Play Wolfienstien: The New Order if you like WWII