The game is boring to me, as well, and I think it's two things, which both can be fixed via patches, but I doubt they will be:
1) useless combat AI = no challenge
2) too high warmonger penalties in the later eras mean there is nothing going on in terms of conflict
1) useless combat AI = no challenge
2) too high warmonger penalties in the later eras mean there is nothing going on in terms of conflict