I tried it, and the bots generally improved behavior-wise.
Not just in Mareth, but in every other map they drive better, especially in Villers-Bocage (Large FCAPF), I saw bots drive through pass-able hedgerows without problems. We have a pretty enjoyable round in Villers-Bocage with German bots counter-attacking furiously, while the British reacted aggressively too.
However, it is still a slow round in Mareth Line, playing as British, the bots capped Toujane with much effort from the human players, then they pretty much stuck there for me. If it wasn't for other players raining down the arty on Mareth, it won't be captureable. The German bots are simply faaaar better this time, I feel the challenge now. Then this is the classical stalemate. Matmata, needs our help too to be captured, simply because the German bots spawned there too many times and in the command bunker.
My config: difficulty (80), count (48), ratio (50 - 24 vs 24+2 human players)
What I see so far (vs. default FH2.3+BF2 ESAI)
Bots do navigate better
Bots drive vehicles better
Bots don't camp too often, they now move for a reason
Bots will attack their objectives, no idle bots, except those manning weapon emplacements
Bots occasionally spawn in main base and take tanks into the frontline (NIIIICE!!!!)
However I notice these problems as well:
Pilot bots will fly off-map when intercepted. This behavior seldom appears, but noticed in almost every map featuring air battles. I tried Gazala.
Defender bots showed its superiority over the attacking one (to reconfirm your concern, yes it is true). For example, in Luettich (Medium FCAPF), despite having superior armor (Panther tanks), they still lose to American defenders due to clumsy attack tactics, that is storming and overwhelm the defenders, which would only work when they are in numbers. Sadly, they rarely group into numbers when attacking.
Special note:
It seems that bots won't continue to the second line flags, when all first line flags aren't captured yet, despite being able to. (e.g. in Goodwood (Large FCAPF), after capturing LePreiure, they just wait and stormed LeMesnilFrementel instead of going straight to Cagny flags, thus making them bleeding to defeat). This doesn't happen before. But overall they still fight better and more determined to attack, occasionally overrun human defenders with better tank navigation (which makes them more difficult to anticipate). The bots in Gazala (Large FCAPF) doesn't attack 2 fronts as well, they concentrated on 150th box, but left Sidi Muftah alone, trapping their offensive there when the British counter-attacked.