To beat Ravines, what I did was spam built rocket trucks and missile turrets. Park the rocket trucks directly in front of the missile turrets and by the time the unit has a chance to fire all the rockets have wiped it out. If it gets stuck on that rock ledge, use rocket trucks to attack from a distance, they have a longer range than the air unit and can take it out before it can retaliate. Just don't get so close that it turns it's turret because that will get it un-stuck.
It's not scary.... Not at all... Also bigshot, the higher your strength, the more you can carry if you hadn't noticed. But it is a good idea for clothes to have that armor system.
In the rivines mission I cant get passed it because of that one massive air-unit. I'd send 4 rocket tanks, three missile turrets and a half dozen apache gunships at it and each unit would come back dead..
Hit + to keep this alive
The best way to kill the giants is by using shadowrath and constantly switching between attacking the front and rear of him, he's too slow to attack you before you are already moving again.
Lol I just kept forcing the zombies into a massive bottle neck lined with machine gun turrets and at the end the wall was 4 jersey barriers topped with barbed wire in front of an anti-tank gun.