games like nazi zombies and horde were around long before the were on 360 and ps3 so technically people copied off those games but with their own flare to it.
the only thing the 2 games have in common is the waves of enemies so you cant even compare the 2 they are totally different game modes and compared to zombies firefight blows it away and like i said before in another post it will blow away spec ops also
hang on, how can you say that they're copying, they're completely different modes. firefight is based on camping and taking out as much stuff as you can before taking on the map, gears of war horde kinda makes you move around and you don't want to stay in one place as if more than one grub comes you are buggered and in my opinion WAW WAS CRAP