i think main battle tanks should have a higher range (maybe 5 or 6) and splash damage in order to become usefull units.it is not possible a single rifleman to have more range than a tank!! As far as now these units (tanks and assaults) are usefull even for the natinos thatt they have it as their special unit.they have a very good hitpoint and because of that nobody uses them.u can make it avaliable units and find their place in a combo with pluralism of units