Fun and some great ideas but ultimately lacking.
I enjoyed playing Distant Worlds, i have no doubt that many other grand strategy/4X fans would like it too. Some good features include the relative difficulty of getting your empire going, the general 'feel' of the galaxy and the possibility to automate a lot of the options. Some of the negative aspects would include the graphics (they're a bit choppy, though i generally didn't mind) and the in my opinion slightly simplistic underlying economy. Plus once your empire gets going the AI really doesnt stand a chance.
If you're a fan of the genre, this game is definitely worth a shot.