I honestly don't want to sound mean. But the story is very over exaggerated, it would take less than 5 nuclear bombs to wipe the existence of humans from the face of the earth, the shockwave itself from the bomb is enough to shatter houses pieces of broken windows, fence posts, door frames, are enough to stake a human body to a wall and as that wall falls to the floor crush more people in the room behind... the heat from the blast melts skin off the bone and chars the bones... and again the radiation will loam so long it will kill life and not to mention the blotting out of the sun killing plants, then leading to the extinction of animals, thus starvation of the humans...
Maybe a bit graphic, but 1000 of them there wouldn't be a world to live on... it would be if this... a floating ball of molten iron magma core in space.
Also I'm not trying to shoot you down by explaining GoW, it was just the top FPS of the year besides Halo 3, how anyone hasn't heard of it let alone it pretty much sky rocketed sales of the Xbox 360, amazed me to hear someone who hasn't heard of it. Also I noticed most of this game seems to be made "on the fly" meaning you have no straight forward shot yet. I spent 2 years of planning on my game before I EVER released anything about it... I took the time to develop characters, character personalities, and the storyline, even found ways to leave the story open to expansion. I suggest you do the same.
I don't hate your project, I don't love it, I don't really know what I think of it now, it is nice and all, but it really doesn't seem solid enough yet to say it will do well or not. I just hope you smooth things out quick.