my feeling so far, from someone who has been with Civilization sense 2, and feels Alpha Centuri was the best game in the series:
1. This feels like Alpha Centuri lite. Lots of nastalga, but a lot of weird things that feel missing or done in a way that is more complicated. Like unit upgrades, they are nice but seem poorly implemented, where as alpha centuri you could literally built your own units.
2. I am very annoyed by how little "text" there is in the game. By this I mean it feels with each Civ they have racheted down the amount of information/details/explanation/faction bios/end game text, ext. Its come to a head in this game where I feel like you basically get a "congratulations you won" end game. What happen to those nice long end game explanations? Why cant they autogenerate a brief "history of your game" text. It doesnt need to be super complex, hell template it out somehow, but give us SOMETHING! A nice little firework to end your game on.
3. I really REALLY like the aliens, a great addition that instantly makes every turn feel like something is happening.
4. I hate Harmony, fucking bastards. I think I'll intentionally always destroy all aliens just to spite them.