The game is not bad however, it is too simple. It is the war that makes it weak. If you see Nobunaga's ambition 14, it has what is lacking here. A way to make it possible to win war even if your army is 100 times smaller than your enemy's. The personal traits should have dramatic effects in battles. So miracles can happen and great generals can change the tide of wars.
It means Koei needs 14 games to improve their games to this level.