I decided to try out this "classic" (which was bundled with Crown of the North), went through the tutorial, and then loaded up the Grand Campaign. In 3 starts (with Novgorod and England), I don't think my country lasted for more than about 5 minutes in any of them. As soon as I hit "start", I got stacks of pop-up messages: declarations of war (mostly against me), revolts (mostly my provinces), a random event, and various other "important" information. By the time I at least glanced at each of them and closed the windows, I had 3 different invasions against me in progress, all by larger forces than my own (it seems like you start out with the weakest country on the map, and everyone else knows it). Before I could so much as click a button to do anything about it, I was down to about 1/2 my initial provinces, and those were gobbled up in the next wave of attacks a few minutes later. Game over. That was on "Easy", with the AI set to its lowest aggression level.
How can you play this scenario? I'm OBVIOUSLY missing some critical point, because it's essentiall "over" the moment I hit "start". "Building more troops" isn't the solution, because the provinces are taken before they're even done building. "Diplomacy" doesn't appear to be the solution, because you're already at war from the moment you start the game, and troops of several different factions are already attacking you from several different directions. By the time you settle one conflict, the others are already assaulting your capital.
The "Fantasy" campaign, where you start out as a mini-empire amid a sea of individual and passive mini-states, is playable, and gave me plenty of time to figure out the game mechanics, but it gets boring when you're the only aggressor until the later stages of the game...exactly the opposite of the Grand Campaign.
I guess I'll have to try Austria or Sweden, because my first choices apparently didn't work.