http://www.kshs.org/cool3/graphics/ftballgameclose.jpg
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Uh, maybe a bit more on this?
Sure, here's a vid about the problems with empire, it's basically applicable to Rome 2, particular complaint is centered around a problem core to the engine used:
https://www.youtube.com/watch?v=naQaRIaXyAU
And the picture I posted, that's what collision modelling reminded me of from my childhood and resembles about the same level of IQ of the AI handling melee in CA games starting with empire.
I watched that video before; the dude makes perfect sense.
I honestly got to agree with you on unit collision, it barely exists. That's why I think Warscape works better for gun powder but is extremely lacking in melee combat.