COD 2 is the hardest, if you can complete it from start to finish then you can complete any other COD games. As for COD WaW on veteran, the only frustrating challenge is the grenade party that gets annoying.
Achievements completion : 99,74%
Gamerscore completion : 99,77%
Retail games completed : 91/93
I'm a completionist!!!
If you send a friend request or game invite, please send a message telling what or why, otherwise I will just ignore it