While I see and understand your want for larger battles. I think the strategy map is one of my favorite points for the TW series. Building an empire is fun. If I just wanted battles I'd play other RTS games, like; Theater of War, Wargame, Stronghold, Real Warfare, etc, etc...
Also one of the great things about total war is you can get large armies to fight each other in the battle creator. While you won't have total control in FoTS or R2 you can have up to 40 unit cards and with the maxed unit size battles can easily get into the 20k unit range.
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