Hmm, it'd be nice if you were able to take over bases, because it would give the game a better purpose, and also have it that your own team's bases can be attacked as well, so that you have to defend them. And then, as someone else said, i think, you should be able to make your own weapon or have a special order. Oh yeah, and what does security level mean? Im still confused by that.
It needs missions, a campaign and also, a sandbox mode.. or.. as someone i saw said, add a health bar to the car, but my idea is to make it a survival mode, and see how many zombies you kill before dying :p.
This game is probably one of the best or if not, most epic games i will ever play it gets 5/5 and if i were able to rate it higher, i would.
P.S. ROOOOOOOOOOOOAAAAAAAAAWWWWWWWWWWWRRRRRRRRR!!!!!!!!!