Very solid Civilization game and the one I would recommend to try if you want to test out this series.

Combat is finally not as random as before, which in addition of having only one unit per tile allows for more interesting approach, when it comes to war. Trade is now being controlled by trade units, which allows more diversity than standard automatic approach. Pretty good balance of civs (but not perfect, sorry Napoleon).

As a downside, warmongering system (relation penalty for conquering cities) in this game is not the best. Also some units should be able to stack (like meele units who protects siege equipment).