At the beginning you have their hands full. You have to do research, ward building and its (equally powerful) enemies. Very important is to ensure the supply of food is. Famines decimating the armies and if it happens once, you can do on the fly bit. This can an empire loosely break his neck. It is powerful, the challenge can be to very hard. At a certain point that is reached very early, there is no serious opponents more. Here the long-term motivation is lacking.
On the campaign map the opponent is acting quite intelligent. Gladly my troops are bypassed and robbed poorly defended towns. The battles are as you are accustomed to epic. The AI is quite good. Permanent she tries to get around and gnaw with cavalry the flanks, while the main body of the enemy head-on as I'm concerned. Constantly annoy an opponent's ranged DPS. The battles also make quite happy. Ramming board, or flaring ... which has what. Too bad that you can not, can, as in Empire, board and keep the enemy ships.
Once it happened that 4 full armies A 20 units participated in a siege. That was really too much for my PC. Without warning, he went to his knees and jerked almost 1.5 hours before herself, until the number was through.
Sense or nonsense of the family tree, I've never understood. The could have been safely omit. Negative, I also think that you can not have units without a General / Admiral and the number of leaders is limited. Utter nonsense, because no city can be sacrificed to additional garrison units stationed without the precious generals. Quite mistaken is once again that you can play some fractions only when one affords a paid DLC. That's my view unabashed ripoff.
I would buy the game again and again, but compromises have to be accepted. It is by far not the best part of the series, perhaps even the worst, because every other title has given me more fun and less hassle.