I forgot to add Venice and Genoa- fighting a desperate battle against the Horde for control of Azow is plenty of fun, if a fairly forgone conclusion .
God, I'm gonna get so much flack for saying this, but I really enjoy playing Castille and France. There I said it... Please don't kill me
I wish I could say thatenjoy the colonialwars
The Aragon game I've been playing has been very fun. Its normal difficulty but lucky nations is on so I've had a fully formed France to my north since about 1500 and it took a long time for me to break Castille. My aim now is to conquer India. I might do a culture switch to Hindustan if possible :S.
Not sure about how dominant that new culture has to be. For example I played GH to Mughals game, moved capital to Delhi. Culture shift decision became avaliable although Tatar culture was still dominant (over 50%), and that particular Indian culture was a small minority.