"Galactic Civilization is the game MOO3 should have been. Look it up and give it a try if you loved MOO2, simple awesome."
Err, or not so much. GalCiv is a good game, but its nothing like MOO2. GalCiv also suffers from the tedium of large empire micro and alot of exploits vs. the AI. Its still a good game though.
Now, before you ask...
Reasons why GalCiv isn't MOO2.5
No ship design
No race selection (though there is customizability)
No tactical fleet combat
No 'Orion'

and many other piddly differences in tech and colonization, ....
Still its not a bad game, just not a MOO game, other than the obvious 4x in space bit...