For full disclosure; I did not purchase the game when it came out. There were too many signs it was an unfinished product. I got it a year later for 75% off and still feel jipped. I purchased G&K either during last falls or winters steam sale also for 75% off and hadn't played it until last week. I wanted to give CiV another chance with the expansion to see if my feelings have changed. So I have been playing every night since then to see if the game had changed enough for my feelings to change. They have not.
Reasons I do not like CiV.
1upt
The first in the series to become less complex
1upt just doesn't work on a strategic level, at least with the size of the maps as implemented in ciV. Plus it is just not historically how armies moved around. Take a look at Sherman's march through the south and you will see his army breaks up into smaller columns so they can forage on the move but they all come together when battles are fought. Plus each column is more than a single unit (yes, that begs the how to compare real units with Civ units but I digress). I know they were trying to solve the perceived SOD problem but they failed and should have known it early enough in the process to make changes but of course that would violate the apparent direction to simplify the game.
All the previous versions got more complex as the series went on. More unit types, more research options, more wonders, national wonders, more civilizations, religions were added, more government types which brought on civics. CiV was the first to reverse this trend. Less unit types, less research options, smaller maps, less number of units.
Another thing I don't think helped is the number of changes to the core systems of the game. 1upt, hexes, global happiness, city states, units to boats instead of requiring transports, etc, etc. All previous games changed or added or removed things from previous iterations but not on the scale that ciV did.