This is a game fondly remembered.
Nothing since has come close to matching the Homeworld series for RTS storytelling, scale and spectacle.
Buyer beware though; if you like your games to wet nurse you from start to finish, like so many do these days, then you best move right along.
This game is a tough nut to crack, the AI will always provide a challenge and lets face it that's where a true sense of achievement lies.
If you're going to invest time in the best Space-based RTS (In my humble opinion) then I would recommend you start at the beginning;
Follow that up with Homeworld CataclysmHomeworld: Cataclysm (PC)
Then, and only then, will you be ready to fully appreciate Homeworld 2.Homeworld 2 (PC)
One day I hope there will be a true successor to two, if that lottery win I'm due comes in then there will be ;)