total war is a good strategy series. very educating too.
if you want to learn about war techniques/ strategies then you can learn a lot from here, just play the game like doing experiments and not just for the sake of finishing the game. each of total war series are based on different environments and different era. the war strategies changes change with that as well.
you see how romans fought the war with different unit formations are different from what indians used in their battle field (lol i was playing rome total in skirmish, first i destroyed a barbarian invasion by forming the usual roman defensive wall with heavy troops supported by archers at their back. but when i used this tactic against indians, the elephants just burged into the roman heavy soldiers and crushed everything).
these techniques get changed when you enter medieval era, how napoleon fought the wars have different troop formations with riding gunmen and musketeers. also, neither of these tactics are similar to japanese shogunate wars, where the landlords like nobunaga and hideyoshi fought with their limited manpower and resources.
each of the civilizations perform best with different military formations and experimenting with it gets very interesting.
yes, total war is different from aoe/ ron with are structure building rts, this is neither like zeus / poseidon / caesar which are city building/ planning rts. but its a different type of rts, thats all about military formations and tactics.