Originally Posted by konny
No.
The only "improvement" is that the AI is useing naval invasions. But that again is terrible bugged: the AI will use this for random landings only. You have a about 100% chance that the Karthagians will land one army near Capua, the Romans on Corsica and the Ptolemaians on Rhodos, and a about 75% chance of a KH landing near Taras (only if owned by the Romans). All this will happen regardless of the diplomatic stance or with any strategical background or even support after the landing. I consider that a bug.
The next bug is the "siege-peace-loop" that usually follows these landings: the respective town is sieged in turn#1, both factions make peace in turn#2, siege starts anew in turn#3, both factions make peace again in turn#4, siege in #5 and so forth. The only places where conquest sometimes occurs are Capua and Taras.
The other named places only seldom change ownership. More often even more weired things happen, like Makedons and Seleucids landing on Rhodos too, starting the funny "siege-peace" game. Or Karthagians landing a hughe army on Crete, leaving it there without taking the town.
That's in short on the "improved naval AI in BI". I would suggest the Alexander engine (even though it has it's own bugs too) or, if not available, the RTW engine. Better no/rare invasions than this chaos.