Edit 12/21/14
Since this thread has gotten more attention than I expected and has been revived several times I thought I should update with my thoughts on how the game has progressed.
When I preordered this game I was hoping for improvements to the gameplay of GalCiv2 not just GalCiv2 with larger maps which is what it seems to be at this point but I did pay to get into the beta and give feedback so here goes. Edit: When I say this I'm not saying there aren't any improvements to 3 over 2 just that it plays very similarly and has the same feel. This can be seen as good and bad, my issue is that while there are a lot of improvements the problems as I see them are still intact.
General game play issues:
Colony management, while I like the bonus tile/adjacency system in theory it doesn't really work well in practice. I tend to build the same things on every planet and most of the specialty buildings fall by the wayside with few exceptions that I build on large worlds. Why even bother with colony management beyond using the production wheel for optimization. The placement of tiles on most worlds aren't very good for optimization anyway so in practice it just doesn't work well and doesn't end up giving the player a meaningful choice. Edit: This has improved since I first posted, diminishing returns on population contribution to production means building farms is an actual choice now and brings the adjacency system into clearer focus. Regarding unique improvements, I'm not sure if I missed the global bonuses from things like the Galactic Showcase and Entertainment Capital but I think all unique builds should act like that. I know the Hyperion Shrinker's tool tip says that you have more space on ships built from that planet. This makes no sense as you can't really use that. The Hyperion Logistics building while useful can cause problems when merging fleets with ships that are build on other planets. Personally I prefer my fleets to be fairly uniform so I know what they can take on.
I've participated in a few discussions about aspects of this and most players in the beta like the system but it completely breaks my enjoyment of the game for me that I can't build all of my toys on all of my worlds and that huge populations are required. One of those discussions I mentioned earlier was about building farms not being fun, I say this because its a false choice, because you have to have that huge population to be productive. Edit: Addressed.
Combat: I know combat isn't in the game yet but that I can't control my ships in combat will always bother me. That combat is effectively rock, paper, scissors further bothers me. At least give me something that gives me a tactical choice in the resolution of combat. Like shields and armor are effective against all weapon types but with point defense tech I can just my guns and lasers against missiles too but missiles fire from further out and guns are laid out in devastating broadsides and lasers are more effective point defense weapons. Something more than, my opponent is using missile/PD ships so I'll build laser/PD ships. This is another game breaker for me. Edit: This seems to have been addressed but I haven't really tried it out much as my attempts to play the Yor didn't work out well and my games playing the Iridium since Beta 2 have been pretty peaceful. I tend to play live and let live but once someone declares war on my I destroy them as I tend to enjoy the building aspect of the game and everyone is too nice while diplomacy is being tested. Not a complaint, observation on part of the testing process.
Research: While I appreciate a large tech tree the way it is implemented at this stage is just boring. If I could queue up research jumping from tree to tree it would be tolerable but most things are just an incremental bonuses and I never get excited about getting a new tech. There are a few things that completely kill it for me, that I have to research each and every treaty when I researched a universal translator after I encountered other races drives me nuts. All of the races in GalCiv have a very similar view of the universe this just makes no sense. I could see it if different races implemented treaties differently but its all the same. Edit: This is much the same, I appreciate that each race has some special stuff and there are some things moved around it play much the same and I'd like a bit more creativity if possible.
Terraforming: That planets are improved for life one tile at a time makes no sense and just bugs the crap out of me. Just put terraforming as a single tech that allows you to build a building that slowly improves the planet to be earthlike and adds usable terrain in increments. Or just scrap the whole tile system and allow terraformers to make the planet more habitable allowing higher populations. Edit: Still the same but can be modded later.
Multiplayer:
There are 2 issues I see for multiplayer, the first is asynchronous turns. That player 1 has to finish his turn before player 2 can go just makes the game take that much longer to play and most people won't sit staring intently at the screen for their turn to start will just make it worse. Edit: I haven't had a chance to play multiplayer yet but I can accept simultaneous planning and sequential execution.
Second is micromanagement. That periodically throughout the game you will unlock new tiles and buildings that you will have to go to every planet to build then when it finishes build what you want there will further slow down the game. If Stardock creates truly outstanding governors that won't be much of an issue but I have yet to see an AI I trust to build the colony I want built. Edit: Pretty much the same, worse with the Yor.
I'm pretty much done already, the game frustrates me more than I enjoy it and it seems most players in the beta like the game as it is or prefer the direction its heading. I don't expect this rant to change much if anything in the game design as most players seem to like where the game is going but at this point I may just wait for Stardock to reboot the franchise before buying another GalCiv game. Edit: The ability to mod just about anything, that things are still being implemented and feedback does seem to be listened to have kept me paying attention.