Germany
Played it a couple of times and here is my opinion:
The first UHV, contrrolling the Rhine bank, is way too easy. You start with Frankfurt and Augsburg. With the three given settlers at the beginning I found Strassburg, Bern and Koeln. Then I build one settler by my own and found Amsterdam. UHV done without any serious resistance. The western civs, Frankia and Burgundy, are not a threat at all. In some games they declare war but don´t attack in others they stay peacefull to me.
To keep it interesting I started expanding east up to the Oder and tried to conquer Poland. Unfortunately if I expand too much my empire collapses although I have a very strong army, excellent infrastructure and even built some wonders although that´s not aim of playing with Germany.
My suggestion would be to expand the territorial UHV so at the end the German empire should be in this borders:
http://en.wikipedia.org/wiki/File:HRR_14Jh.jpg
Furthermore I would recommend to make the Norse more aggressive against Germany so you have to protect your northern border.
The second UHV, have three vassales, is imo a random UHV where you hardly have any influence. Sometimes I had three or even more vassales very early of the game although I haven´t done anything and wasn´t that strong. In other games I even had none although I was powerfull and most of the civs liked me.
Third UHV, strongest army in Europe, has not been fullfilled yet. Can´t say if it´s easy or hard to fullfill. But if I see how my neighbours are performing I don´t think this goal will be hard to reach
Still great mod although I don´t like getting instability points if you expand too much.