Have a look at Sweden in 1715. Netherlands invade, and defeats the Swedish army. Even as the Netherlands armies try to spread and siege, Sweden bounces back and kicks them out in 5 years. Same with a GB invasion of Norway a few years erlier. I do like the fact the AI knows how to defend, fall back, regroup and consolidate, THEN charge in to retake. I lost count the number of times in EU3 the enemy ends up with lots of small stacks, not even trying to regroup, and my army, larger than his small groups but smaller than his total power, steamrolls over him province after province. One more thing, I seriously doubt GB and Netherlands went to war with Sweden for territory gain (at least European territory) so we might be seeing a full blown trade war going on there. Something the previous EU games lacked.
I think that even playing as a medium nation (Austria, Poland, Portugal for example) on very hard difficulty, the AI is going to murder you in 100 years. Lovely way of seeing how things play out, I am certain the french situation is handled very differently every game, some games, Burgundy manages to get the upper hand (they are equal if not stronger than France proper at the start) and some games, Burgundy can fall to its game over event within 10 years (check the Battle for the balkans stream paradox made this spring.) and create very powerful France and Austria right off the bat. Without Burgundy there, any English attempts on the continent (meaning, France) is doomed to fail.