Most of the issues have been detailed in other reviews, so I'll keep this one short.
If you are a fan of the original SotS, just stick with the Complete Collection (Born of Blood, Murder of Crows, and Argos Naval Yard) and avoid this. The prettier graphics, bigger ships, and larger systems are not worth all the bugs, dreary gameplay, random crashes, and generally unfinished nature of the game (the in-game SotS-pedia help guide is mostly blank pages or just unhelpful). Trust me.
If you are looking into Sword of the Stars and want to buy this one because the graphics look better and the story seems cooler than the first one, don't waste your money; go buy the original Sword of the Stars Complete Collection and enjoy the game and the universe before it was left out in the cold to die. If you ignore this and figure that you'll pick it up anyway and give it a shot, and you end up being disgusted with it, do yourself a favour and pick up the first game and try it too.