Anyone playing Zombie mode?
I love it, so fun. Highest I've gotten is level 23.
I think they should have implemented some upgrade features to your weapons. Like after wave 15 or something, you should be allowed to upgrade your weapons so that they are more powerful, have larger ammo clips, or faster reload times. I guess you could say there should be "perks". Even extra health or body armor would be good.
The bonuses that the zombies drop already are good, but as you get higher in waves, you need more max ammo drops b/c it takes 10x as many bullets to kill a zombie vs earlier level zombies.
I think it would be cool to be able to upgrade your weapons.