I love Sins of a Solar Empire and I have played several games. The one thing that I find that needs more use is lore. Not a campainge but more rewards for exploring the galaxy. The artifacts are cool but there could be more. I find it anoying to dock resources into planetary exploration when I find nothing on that planet. For me and other who agree (if any) It would be cool to add little bits of info that you can uncover by exploring planets.
Some Ideas
Put money into planet exploration and find a Hero (he adds something or another to your empire). Find new leathal desieses that you have to heal (with reasearch) but then can launch at enemies. Viral warfare. Instead of bombing a planet you make them sick. Also It would be neat to have stories. Not storylines but optional things to read about a trade port or a shipyard. Like stories for those people who like the explore and expand but make it benificial to do those things.
It would connect the user with the game. You could read almost like a book whats happening with the game. What the people are doing. what specific trade vessels think about.
It would also be cool to see more of the artwork that went into this game. The pictures that are on the loading screen show things that I dont even know where they came from or what they do. Some ingame explination accompanied by a picture.
One thing never was so much.