easy way to win M2
Play as Denmark
Win.
Seriously, Denmarks Homelands are sooooo easily defensible, almost unbelievable.If you take the rest of scandinavia(Which you should do anyway), you have pretty much an impenetrable Fortress.Keep one big Army down in Denmark to Fend off possible Invasions of Holy Roman Empire, and one Medium Army up somewhere in Sweden, just in case.Done.
You can then proceed to build ships and possibly take the holy Land in Crusades, to build a new empire down there(With your super-fortress Homeland as backup), or even invade spain.
You are pretty much able to do whatever you like once you conquered Scandinavia and established your first defenses.