I have never attempted to directly compare the AI of RTW and MTW(VI plus patch, that is). If I am playing MTW(or RTW) I don't play the other. So I can't compare them easily, I have to go by memories. But, after starting up a game up VI, I have been challenged far more than I used to be in RTW. Part of it is simply the gameplay but some part is the AI. Everytime I attempt to develop just the right formation and tactic, the AI reacts and fouls things up before I have moved ten steps. The AI in RTW seemed more willing to sit still. The posturing and use of terrain seems to be the biggest difference, IMO. If I set myself up on a mountain, my forces facing south(a hypothetical facing, for reference), the AI cuts across the mountain from the west or the east. The MTW AI also seems to be able to hold a tighter formation, presenting fewer holes.

the hardcore players often forget about the noobs.
Indeed. Now if only CA would forget them as well.