The strongest castle in Heroes of Might and Magic IV.

I agree that each faction has its own strengths. As has been said many times, and the faction you are most familiar with, the one you have become accustomed to, will seem the best to you. Perhaps I am wrong about the overwhelming strength of the Haven faction; after all, the developers aimed for a certain balance of power. But still, it seems to me that Haven is the best faction, and that is my opinion.