Is it normal AI behavior?

[Cruelsader]

I am a veteran STW, MTW player. I installed RTW gold yesterday. I am currently fighting my first imperial campaign as Julii (normal/normal, unit size one step bigger than normal, v1.6, bug-fixer 3.36 applied). The game looks good but ... the battlefield AI appears retarded. For instance, I attacked a small rebel army with an equal force; however, I had one less command star. As I am not used to high speed of movement my units got scattered and separated and one of my hastatii ended up engaging with its rear towards enemy general cavalry unit that stood unengaged just 20m or so away. A perfect "sandwich" opportunity for the enemy! In STW and MTW the unit would have been royally screwed. However, the enemy commander just stood there doing nothing. There was no reason to keep away from battle as all my units were either far away or routing. What the hell?

In another battle I attacked a superior force. I had one unit of archers and the enemy had none. I sent the archers forward to harass the enemy. In STW and MTW the enemy would have sent a unit to chase the archers away. No such luck. They just sat there taking fire until my archers ran out of arrows.

Is such AI behavior normal in RTW?

P.S. The campaign is a cakewalk despite the fact that I do not understand half of the features of the new strategy map. I just walk over the Gauls with no real resistance. Am I really that good? Or is the AI seriously lacking?