Did anyone here ever played Resistance 2 co-op ? I think Insomniac nailed the classes superbly in that game. You had the Soldier that had the most high-damage weapons and deployed temporary shields others could get behind, you had the Marksman that refiled the others with ammo and you had the Medic that refiled the others with health. The classes were so interconnected that on the lobby you had like 10 seconds before the game started and everyone would switch class to make sure they had enough of each. On the rare occasion players didn't adjust and stacked on one class, it usually meant an early loss: not enough marksman and everybody would run out of ammon, no medics=constant wipes and no soldiers=few cover and weak firepower.