I played a free version for a few hours, but it many updates behind. I bought it to try the most recent version, wondering if the problems I was having with it may have been addressed. They weren't.
I don't mean crashes or broken AI - I can't even speak to the AI. I just can't get a handle on the game itself. I don't know if the map gen is broken still or if it's working as designed, but maps are small, habitable planets (extreme or not) are ridiculously rare (meanwhile duranthem is ridiculously absurdly common compared to everything else), are low quality, and even if you find a planet with a decent PQ rating, it may be nigh worthless because all the tiles are in lines or outright scattered, making it very difficult to really work with the new adjacency benefits. The new trade goods often also take up valuable space, even on your homeworld! Compare a Drengin homeworld versus a Krynn one, for example. The Drengin get 8 tiles in a ball, while most other races the planet tiles are pretty much randomly scattered about... and then you might even get a random worthless trade good taking up a tile (but I guess you could just destroy those if you want).
I don't know if that improves with terraforming later in the game, since I never managed to stick through a game long enough to research to the last of the terraforming techs. I was definitely disappointed to see that the techs unlock only one tile each, at least of the ones I did manage to get through (I've seen hints that the last tech allows you to upgrade all the potential tiles the first tech unlocks). In GC2, the techs often unlock many tiles on planets with low base PQ.
On top of that, they really didn't do a good job at improving the monotony or the interface in general (compared to GC2). Ironically, the non-updated free version I tried handle the constructor game better than the updated version. Handling multiple colonies is still a hassle, perhaps even moreso because of how selections "flow" after issuing a command; having to constantly re-select the list cancelling queued buildings, for example. Or having to destroy a building manually before changing the building that will be placed there. And if SD never had a clue to fix or improve these things in the transition from GC2 to GC3, they probably never will. I doubt the interface is moddable, either, not to the extent required.
I don't know, maybe I just expected a prettier GC2 but got something else instead. I do like some of the new mechanics: the way shipyards work, and the adjacency rules themselves (it is just that, with planets as they are, it is difficult to make use of them in a way that feels viable). GC2 was by no means perfect, but GC3 doesn't feel like it is better yet.
Anyway, I'll be asking for a refund.