I bought the game when it first came out, since I loved Master of Orion 2. And based on much of the gameplay, Gal. Civ. is what Master of Orion 3 should've been. However, the only gripe I do have is that there isn't enough description about the research fields that one goes into. All you basically get is... "You've researched this, so now you get to research this..." It would've been nice to know exactly what I'm getting weapon-wise if I were to research Laser II. The other research fields do an all right job of describing what I'm going to get regarding improvements and stuff, but weapons and shields just seem to lack the technical details and depth I would like to expect from a strategy game.
All in all, I had a somewhat hard time trying to actually get into the game, since for a long time, I didn't understand why farms were such a detrimental part of planet building. And in effect, I felt that made it very hard to win on a difficulty level more than NORMAL, since most times, the AI usually expanded incredibly faster than I did when it came to finding planets and colonizing them. So as a result, you would have to resort to the few planets you had and try to get as many credits from them as possible.
Overall, I liked the game. I'm just nit-picky, I guess. And in my personal opinion, it would probably not rank as high as Sid Meier's Alpha Centauri, which I still play to this day.