SOTS seems like the kind of game I could really get into, but everytime I've tried I've been foiled. Part of it might be that I got SOTS1 and SOTS2, and fooled around in both rather than focusing on one. The base mechanics seem fairly different on both - SOTS 2 movement definitely gave me a "ruling an empire" feeling for a while.
I don't like combat though. Putting a little lacklustre RTS that you don't really trust auto-resolve with just sucks. To me it always felt like a chore rather than something I genuinely enjoyed doing.
It also felt partially simplistic, in particular the empire-building part. I feel it definitely focus a whole lot more on the military aspect, whereas I enjoy genuine empire building, where economy and diplomacy play a larger part. On the other hand, the tech tree is great once you know it, but it's just HUGE to start with, with very little easily understandable differentiation between the base weapons (e.g. lasers of all colours, slightly different).
Stardrive came a little closer to having a proper empire. Diplomacy plays a much more serious role, and there are some empire infrastructure basics that I enjoy. For instance, you need freighters to keep your industrial worlds fed with foodstuffs from agricultural worlds, and waging guerilla warfare on an empire's freighter infrastructure possibly bring a viable strategy. Ship design had more complexity/detail that what you really ended up feeling the need for, as in, you have too much customisation that you don't REALLY see the results for, and the ground combat almost ruined it for me. Getting troops to other planets was definitely a chore, made it hard to defend, and a chore to attack. Meh.
It had so much potential
Distant Worlds seems awesome, honestly, but $$...