Topic Title
Do you want to know why the Call Of Duty series is so popular? Nazi's. Think about it. A good example, Wolfenstein. This years Nazi Alien first person shooter. It wasn't that popular, was it? It was rent worthy, and no one was really interested in this game. But take out the alien part, and improve the graphics a little bit, and you have a winner. Why, for years, do we still buy war games, set in World War II, with the same Nazi formular over and over again? When it first started out, it was a fresh new look on shooter games. No one ever saw the likes of continuously spawning Nazi bad guys, that you could shoot over and over again. Recently I bought a few Xbox original games. Two Brothers In Arms games were included. I am playing them, and they do feel the same as any other Nazi war game. Continuous armies of Hitler serving bad guys, that have no real effect on the player anymore, like they used to back in the day. World At War tried to mix it up a little, with Japanese resistance, but it still felt the same, although the game was, and still is, fantastic. That brought Nazi Zombies along, which wasn't really fresh in the entertainment side of the world, really. But it was fun to play, but now people are playing it too much online (which I don't find fun at all) that they are getting bored of it. Now, the Call Of Duty series is expanding further, with the rather amazing looking Modern Warfare 2 being released next month, and a rumoured seventh game due in 2010, set in the Vietnamn war. If they do fade away from the Nazi era a little, I feel it might be too early, because we are used to slaying Nazi's, and if there isn't a Nazi game once in a while, then I think the First Person Shooter genre will fail. But having said that, more and more First Person Shooters are straying away from the Hitler madness, with Modern Warfare 2, Bad Company 2 and a rumoured Resistance 3, following the amazing other two alien blasters in the series, we may be forgetting about the World War II genre for a bit now, and hopefully, progressing into the twenty first century! We'll just have to wait and see now, won't we?

Comments
Better guns
Looks cooler and more stuff but can't be bothered of thinkin of more =]
Modern warfare stuff is just plain entertaining for anyone, so those kinds of games sell...think of all the Tom Clancy games out there...that's all modern stuff. I think modern warfare games make it easier for someone to imagine using all this cool equipment, but without having to sign up to go fight in real life.
But I think Vietnam will be a tough sell for the world market. It would sell well in the US, but would other countries' gamers want to play in a US war? (True that the French were there before us, but still...). It would be like asking if US gamers would want to play a game about the Falklands War...maybe/maybe not (would probably make for a pretty short game regardless). A Vietnam game would also need to be so well done that it came across as a war game, and not some preachy game about atrocities and whatnot. It's not like there weren't atrocities in WW2, but war was war back then and no one focuses on that because there was such a clear enemy we all could hate together (the Nazi's).
@dan_scfc: I don't agree...there was a HUGE CoD following prior to CoD4. You have to realize also that CoD4 is not really their "fourth" game in the series. There were a bunch of others in there that just didn't get numbers next to the CoD name.
jahan25