Civ 5 Is a really solid game! Have you ever played supreme commander?
I've been in and out of the Civ series and V was probably the best. I like VI a lot, but, it is a little too much sometimes. Like the difference between some of the Total War series. Some are fighting with a little management and others make you think about each character to tune up as best you can. I don't really like the character tuning elements in something like Tree Kingdoms where in Rome II it was just another thing you can do. To get the top benefits in VI, you pretty much have to increase environmental risk. I didn't mind minor errors making a loss at higher levels, I hated losing because some volcano went off. A volcano you had to build by or would have lost in the regular part of the game anyway.
I really write because of Supreme Commander. I remember playing it when young and bought the series on a Steam sale some months ago. Went some hours and remembered the key sequences and had some fun. It was fun, a lot of fun, for a while. Then, it seemed to change to work. On one scenario, I was doing the build-up thing and found a problem area I was going to have to send some resources too in order to fight the enemy. After a couple of casual tries, I started calculating. I needed at least so many of one thing and at least so many of another and I needed another but didn't have the building so had to make the building and then... And then I realized I was just making a todo list in my head. It wasn't really a todo list as in a Civ or Total War game, where you had to use strategery to determine what you needed, but a more mechanical calculation. I needed to make the production to go to there to overwhelm the other side. It was going to take some time to build up the buildings and the units, but the result was clear--a couple hours from now.
That seemed too much like work with out the "hit" of overrunning the enemy with overwhelming force being hours of click-work away. I haven't touched it since.