I played Shattered Galaxy a lot as a kid. It was a neat concept, but you were very reliant on your team, and, obviously, if people had played more than you, they have a huge advantage. Still very cool, I just don't think I could go back with so many better options out there now.
I liked the "Faction Battles" of Shattered Galaxy, but it was a bit stupid that no side could ever "win". It was just an endless, rather pointless fight. I liked the Faction Battle aspect all the way back to the original Total Annihilation Galaxy Wars that most people don't even know about. The idea of fighting an RTS land battle over galaxies is amazing, but no game has done it well enough so far.
I'm hoping that Planetary Annihilation fills that void for me.