FIRST PERSON=EASY TO DO WITH SOURCE.
I really think MP without 3rd person would be fine and would suit the game well. Combat is hand to hand, which is a chore in first person, and for multiplayer, when you're using projectiles, adding a crosshair to ALL the weapons would be easy. Then it would be perfect. Remember, everybody you will (hopefully
) play will be in third person also, so there's no disadvantage. I can't wait,