I am rather inclined to say that RTW AI was betterthan M2TW.

In M2TW I can walk my entire army save the general around the back of the enemy and say hi without them doing anything when outnumbered (outnumbered AI is still VERY passive). The AI only reacts to your general's position when its not engaged, which is a big mistake.

When the M2TW AI feels it has more units than you, it will head on charge you even if you are the attacker. That makes it dead easy for you to stand on a hill far away from the starting position.

M2TW AI almost never (emphasis on almost) flanks you but matches its units up against you. In RTW, it would always send at least 1 or 2 units via the flanks.

The AI now sends archers running (not walking) towards your position so you can run them down with cavalry while they are some 2 army lengths away from the main regiment. It also never cares about its slower pike/halberd units and they usually engage after their main army has been utterly destroyed.

The AI never even tries to defend its siege equipment so 1 cavalry can take care of all their siege in their rear without the army doing much. Also, if you attack a unit in their rear and are of considerable distance away from their main force, the main force will head on charge your main force, even if they are outnumbered and you are on a hill.

Note this is all VH.
The M2TW AI is way too exploitable.