It´s an 4XRTS, a mixture of 2 genres, but it seems it´s not as strong as each one alone. Let me explain:
-4X are mostly single-player games, like Civilization. Sins has so few technologies or upgrades to even match Civilization IV at this aspect. So, long matches against a doxen AIs would be boring for the easyness of having top tier and research everything from the technology tree.
-Most famous RTS, like Age of Empires or Starcraft 2, have strong multiplayer communities, which are obviously really competitive, but Sins can´t be competitive, why? few players at online (matchmaking or ladders won´t mean anything with this aspect) and unbalanced maps.
In conclussion, it´s not so deep to play single player many hours long and it´s not enough competitive to even play a lot online and having a fair challenge. Why are you playing this instead of other games? why do you like Sins of a Solar Empire?