OK, what I think this game needs at the moment:
1) Some way to attack enemies when completely unarmed.
2) A disorienting blur effect when hit by the butt/stock of a weapon.
3) Realistic tank armour with actual armour thickness, angle and penetration figures. Thats my "No!" for Hit Points.
4) Player models falling down when injured in the legs or torso.
Things I'd like to see, but which are not essential for gameplay:
1) Loud tanks and a blur effect when one drives too close to simulate tank phobia.
2) Player names pop up too easily at the moment. A player should have to focus more on player models to see their names. Hovering player names make the game look arcadeish.
3) A way to identify who's in a friendly tank (i.e. hovering player names, when a player focuses on the tank). People did mark their tanks, so this wouldn't be horribly unrealistic.
4) SdKfz-221 (MG) or 222 (autocannon) Panzersp