I think that the game owuld be awesome if you were merelly "just another man", as in there were tons of AI around you, each reacting to the goings on around them, with the Battle flowing, not always the way it can go. As the battle progresses, so do your objectives. You may have to be a sniper one second, then a machine gunner, etc, etc.

How cool would driving a tank over the trenches be?