On topic: I've only played as Spain and Scotland so far so, can't really say overall.

In light of all the responses about the Scots being the weakest faction I was going to remark that I've had a much easier time with the Scots than I had as Spain.

Then it occurred to me that the Scots are benefitting from the hours and hours spent getting my butt kicked as Spain while I learned the game. Which made me realize that if I had started playing the game with Scotland, the game would have loaded up, and the the 'Faction Destroyed: Scotland.' message would have popped up.