I played about 3 hours last night when it unlocked and whee boy, I knew this wasn't going to go over well.
-The game crashed three times trying to launch it for the first time. I eventually it to start using the Vulkan dlls rather DX12 but maybe it just needed to get it out of its system. It never crashed after that
-UI is just so utterly meh. Hard to get information you want out of it; its not clear how to navigate it. It seems its trying to streamline and that's great but you need to serve the users needs/facilitate the UX, and it seems like it was designed more with the theme than the player in mind.
-WTF is up with the maps? I picked as big as I could "Standard" and I had 2 other Civs and 3 independents (2 hostile) within a stones throw. I always play my first few games on bigger maps to learn the mechanics but in this case, its straight to the bricks. My scouts barely pulled back the fog, which was cool, and there were friends, and by friends I mean hostile enemies.
-Lots of the game mechanics seem fun. The "new" to me commander stuff is cool, the city building is cool: the hybrid district buildings, automatic semi-improvements, etc there are lots of neat things here.
-There's a bunch of new stuff similarly named; the systems need better distinctions and guideposts.
-The random map also put me on a small cramped continent with a cold, rocky southern start with no navigable rivers. There was almost nowhere my units could move that would take their whole move, even as I spread out the little I could. The Flood mechanic is entirely new to me, and nearly killed two of my units as I was trying to cross a river.
-The researching the techs multiple times for cool bonus is actually a neat idea in practice.
Overall, I think its fun but unbelievable it shipped in this state, with no large maps, no England Civ? Napoleon is a Diplomatic Economic leader? (I didn't realize he was locked behind 2K account, I already had one; I have an email set up for these assholes).
It's playable and fun now but it should be in early access for another 6+ months; Greedy corp/publisher syndrome strikes again.
Edit: I intended to write this is my UI/Streamlining comments but It really feels like these compromises, both the good and the bad, were made with steam deck/handhelds/consoles in mind. The holding back of content or releasing before content is complete is terrible and Firaxis and 2K are going to hopefully pay the price for these terrible decisions.