High PD kinda useless.

[NTJedi]

Patriot said:

Anyway, if the computers actually defended each province well or ranked up a high Province Defense, I might avoid attacking, as replacing 200-300 men and merging them takes time. I think the biggest thing about Province Defense, and it explains it in the loading screen between turns is that, Province Defense returns full force if not defeated and at no cost to the player.

Yes even tho Dominion_3 has more gold available the computer opponents rarely invest in province defense. Personally I would setup the computer opponents to place a minimum of 8pts in province defense and then have them invest 2% of their total gold into province defense for existing provinces. And provinces with forts/castles and/or high gem income should have a minimum of 15 province defense.
It's sad attacking a computer opponent only to discover their average province only has a total of 4pts in province defense after 35 game turns passed.