As far as I know it always plays out differently and that's part of the fun. Of course there are some things that happen most of the time but balancing the AI and esp. autocalculated battles, which the AI uses all the time, is harder than balancing the units just for battles against the player. That's one reason (or at least it's widely believed to be a reason) for the Lusotannan to rampage all over Europe at some point in the game.
As for Rome losing to the Gauls, that's a rather rare sight, I usually see them pwning the Aedui early and the Arverni never grow very big. It's rather Carthage and later the Lusos who bring about the downfall of Rome.
That said, M2TW offers better possibilities to mod the AI so we might see improvement in that area
Give a good reason why they should. Hint: Don't say "because they did in the movie".(2)- Hoplites should be able to form some testudo like(made by roman legions) formation, as we saw in movie troy made by acklies(Braud Pit).
On the campaign map this was implemented as movement penalties in EB 1 and worked rather well imo. I'm not sure it can be implemented on the battlefield, which is probably what you're talking about.(3)- There should be weather fatigue(in winters) and area fatigue(for examples, for romans in far german nd british territories nd far eastern deserts. similarly for greeks in far scythian areas and indian territories). This fatigue factor is extremely necessary to make gameplay historically accurate.
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