When I first played 'Race for the Galaxy' I genuinely did not have a clue what was going on. It seemed rather too needlessly complicated for a simple card game.
But then.... after my third comprehensive thrashing, I suddenly had one of those moments when it all fell into place (and I understood the rules). OK, this is one of those games you have to persist with, but once you've mastered the basics, you realise how clever the game dynamic is, with a million different permutations. The expansion continues the story of galaxy domination and allows for more players and more start off planets. There's also more chance to get Victory Points with various peripheral targets.
But the best thing about this game is the clever way you can combine cards and glean more cards and victory points every turn. This requires a heap of skill especially since there's no direct combat between players. It's basically, build, explore, trade and gather victory points.
You need to be a pretty disnerning game player to get a kick out of this..... but it's fun for those who persevere.
Only drawback - the rule book is a little heavy-going with tortuous explanations which would look better in an instruction leaflet on how to put up a Korean shelving unit.