To be perfectly honest, I thought this game was close to horrible. The graphics were amazingly bad (I doubt it's legal to use those Google Earth screens), the gameplay was third-rate, and the whole idea of terrorists taking over the world was immature and not very well thought out. Sorry if I seem offensive, but this game did not turn out good for me.
Although I am no fan for violent and gory games, this was an 'okay' on my list. The gameplay was a little repetitive (shoot, shoot, reload, shoot, shoot) and the targeting system is less than satisfactory, however, it has good replay value, and I enjoyed shooting up some zombies.