Chomsky and Zinn have a trenchant critique of the colonialist doctrine of endless war against a dehumanised other implicit in the zombie genre. The corporations use these games and movies to condition young men to slaughter brown people living on oil-rich land without remorse.
I played this almost until the end. Once you get all the upgrades, there really isn't much to do and your car doesn't really kick that much more ass. But it's fun for a while.
Also, the helicopters are retarded. The only way to kill them is by driving on the shoulder, which is invariably cluttered with wrecked cars.
That said, I am so over FPS and zombie games. Wake me up when they do one with cuddly teddy bears and flowers.
If you like driving beautiful big boat 1940s coupes then you have to try Mafia II.