no need to have this discussion, Steel beasts is the perfect tanksim.
I can't seem to load up the Pzkpw IV in it...
I'd be looking for a engine that has games in both the modern and WWII era tanks. High fidelty on the weapons systems, attention to historical detail (please no balancing tanks for MP, or WoT's awful mutants!), with good AI, and preferrably enough campaigns that teach you how to work the tactics, and even more, why they work!
. I'd prefer all important systems working from interior models, but obviously, make each station automated enough to where you don't have to pour sand in the transmission to make a slipping clutch work, or spend 45 minutes outside fixing a track, lol.
Don't make me a platoon leader off the bat, let me earn it!