Also found that being the mech and going right for his legs works pretty well, esp. in the 3rd wave when the guys in the hoverboards are constantly shooting missiles. Again this will only blow the caps off of the knees, you still have to throw the mines in the holes. The mech is nice because you dole out a bunch of damage, and take a lot less damage. I was struggling on the 3rd wave before I did this.
I once got busy in a Burger King bathroom. - Plato