Loved SOTS, hated SOTS 2. Not necessarily because SOTS 2 is bad but because of what it could have been.
Research, good.
Ship design, good.
Star systems instead of planets, good.
Star bases, good.
Leviathans, awesome.
Removing destroyers, bad.
Limited fleet size, bad
The entire order system, DIAF.
They should have left the free movement from SOTS 1 and combine it with the star bases having a supply radius. If fleet inside radius, then a certain number of freighters are required for supply. Outside of radius, then limited supply comes into effect.
That simple change would have eliminated 90% of the complaints and added depth over the original. And may have reduced the complete fail of a launch as well. I still believe the AI cannot handle the order system either.
As for the topic at hand I did not care for GalCiv 2. It was too simple with its rock/paper/scissor system. I dislike all games with that as a design focus. As such I will pass on GalCiv 3.