Supreme Commander

Supreme Commander's heavily strategic gameplay makes you think about cost versus benefit - you'll have to decide early on what kind of army you need. Do you go for that huge wrecking-ball battleship or field a fleet of swift destroyers? You can never do everything, and that's the point: you'll need to make wise strategic decisions that outsmart your enemy. Scouting, coordination and combination of arms become more important than tactically out-maneuvering your enemy on a small scale or mining for resources.