There has never been a smart AI in any total war game game, i doubt rome 2 will be any different unless you wish to bump it up to very hard,but this doesnt improve the AI it just gives it a bigger advantage in morale etc...
Dont be fooled by these claims every demonstration game i have seen so far the AI could of been hammer and anviled to death but the human either didn t wish to or was incapable of doing it i assume its the first as it wouldn t look very impressive for pre game orders.
The human mind has always and will always be the only way to pit your wits in this genre....
The AI in empire and its patch napoleon was actually retarded on release.