Not everything revolves around Call of Duty games, which many, many people think it does.
How do you know it wasn't the other way around. Do you know how long ODST was in development? (I'm not meaning when it was released publicly either)
You can't just see something in a game and say "that copied of call of duty".
If anything it copied GOW2. If it copied waw, then the weapons on the walls would have to be bought and the covenant would be hungry for flesh. It's not really copied because, if it was copied it would be exactly a I described it to be. What they did is what every game that has this type of thing in it does. They take the idea of a concealed area and mold it to fit the shape of their game. So to sum up my vote in one word. No.
It's more similar to horde mode in gears of war 2 than nazi zombies. The only thing firefight and nazi zombies share in common is constant waves of enemies but the way you play both is completely different. Fightfight was alright but it got boring very quick it's just a very linear game mode not to mention it's a pain just to get a group together to play it since they decided to have no matchmaking system in it and for me personally results in having to make constant visits to the classifieds section on bungie.com to find random people to play with.
I'm pretty bored with Nazi zombies too and pretty much just looking forward to spec ops in MW2 and see what this has to offer.
they are similair but that doesnt mean that they copied them and also there are large differences in both games but they are both similair by giving you large waves of enemies