I can vouch for that Mark, Assault can sometimes favor a player, but it takes more than that to beat me! You got to have the skills to kill me! Trust me, I took control of a Bazooka vet once, and I took out half of my opponents Battalion with that one grunt. Ah, that was awesome. I didn't know WHAT my opponent was doing, but it was epic!
Anyway, Co-Op is shitty if you don't have direct contact with your partner, as they will usually feel like it's a fucking one person mission and you'll both lose!
God I hate playing Co-Op.
Skirmish is basically a lightning strike warfare requiring no tactics and only total destruction of your opponent's battalion. I lose this mostly because I'm not good at lightning warfare.