I have a serious conundrum when considering these books. As mentioned in my review of the D20 Call of Cthulhu book, I hate the D20 system with a passion. I am, however, a dracophile, and that means that if it involves or has dragons in it in some form, the odds are good that I will like it.
The Dragonstar campaign setting further compounds this problem by adding one of my favorite themes to its campaign world: what would happen if technology and magic met? At what point would it be more feasible to use a Fire Elemental to power a starship than a fusion reactor? Would the two ends of the spectrum blur so much that they could not be considered separate any more? And so on. Toss in some Firefly- and Star Wars-esque space battles, and I'm pretty well hooked.
If only it didn't have that damned D20 system, it would be perfect for me. And before you start thinking it - I've tried conversions and system changes before, and I'm no good at it.
The Dragonstar: Galactic Races book covers a number of races that the player characters can be, building on the standard templates of Human, Elf, Dwarf, Halfling, Gnome, and Half-Orc that exist in the D20/D&D game world. Some of the races are far from what could be considered humanoid, while others are just nominally different in appearance, giving flavor and texture to the kinds of beings that are found in the vast expanses of space.
Since my gaming group was fairly adamant about playing the D20 system, I was required to play it, and even though I had a serious dislike for the system itself, I did enjoy the chance I got to play a couple of the races from this book, even though we weren't playing the actual Dragonstar campaign world.