It is merely challenging to be at war with everyone- I can for example even pick my enemy, by offering peace to everyone else (who will accept it), and just killing then the smallest coalition out of them. This setting of the AI is, if I would play a real 'powermonger' strategy, even easier- I need not to declare war (no stability loss) and annex the next small country or even his allies as well. It unfavors even the more peaceful players, who are rather trying to build than anything else, and only take if they DO get attacked themselves (or they try to get land from the non- european countries)! I am also annoyed that the computer has a badboy value which is way worse than mine, but to him (in this case France, I should perhaps set it to a 1000 for fun), nothing happens.