It ain't perfect, but what is?
I don't see any reason to wait. I think it is quite playable and fun 'out of the box'. Plus they already have a patch for some of the worst little problems planned for tomorrow. The only problem I've seen is one of my autosave files got corrupted (somehow) but I was trying to develop time travel and prevent an invasion, so its my own fault for tampering with Space-Time.
There may be a few little bugs, but that is to be expected. So far what I have seen out there is nothing to get too excited about. Also in some cases, what some people say "needs improvement" is simply a matter of personal taste. In fact some of the 'bugs' aren't, they are simply design decisions that the poster didn't agree with. AND in some cases the 'bug' is something working as designed, the poster simply didn't understand the how or why.
So, if you're looking for the game that MOO3 should have been (now there was a pile of poo that shouldn't have been made or purchased by anyone), then you've got it with GalCiv II!
(Psst! When do I get paid?)
Kidding! Kidding! I'm just another shmoe, and so far I'm happy with the game.