Loved by its fans and missed by almost everyone else, Sword of the Stars was perhaps the best RT4X game of the last year. The RT4X genre is "real-time Civilization in space." Take charge of a race; lead them through space to glory, to the detriment of all other races.
But first, the bad news: Born of Blood still looks like it's been created using the 3D digital equivalent of poster paint and potato shapes. Whether you'd find the graphics charming or infantile is a matter of taste, but SotS made a far greater impact on the gelatinous blob that lies behind the retina.
As standalone expansions go, BoB is cheap enough, but unless you really loved the original like a first-born child, you're hardly going to be that bothered with a new race, some added units and ship sections, along with a tweaked user interface.
Sure, there's more to it than that, but the single-player still lacks any narrative progression. In fact, it isn't until you spend some time in-game that you notice the changes. And when you do, about 70 turns in, they explode like a firework.
BoB also features turn-based pondering - now with trade and diplomacy too - interspersed with short, sharp real-time battles that almost rival the best of what Total War has to offer. In multiplayer though, it beats it hands-down.