I had a really good campaign with the Danes. I took all of the rebel settlements around me using practically all of my starting armies and then made peace with my neighbours and built up several biggish armies with the money generated from trade and the cities i had. I then marched south and destroyed the HRE with them and carried on into Italy which practically bankrupted me becauise of all the mercanaries i had to hire but it left me with a massive strip right down the middle.
After this i made an alliance with Scotland and helped them destroy England, taking several of their settlements. Straight after this i betrayed the Scots who were quite weak from the war with the Brits. This left me in a good postion to attack France from two sides which took them out of the game pretty quickly.

I have found that the Danes have a really good economy and have some epic infantry and is probably my favourite faction.