Originally Posted by Darvin
That system was basically the diplomacy system in Sins of a Solar Empire. It was good for the first hour or so of gameplay, then it got boring and people turned "locked teams" on to disable it. You need quite a bit more depth than that to make it interesting, like why an attitude changes over time.
I liked the Space Empires V system, by example. More complex than Sins of a Solar Empire. Europa Universalis II has a great system also, or Dominions, Supreme Ruler...