Aurorans are supposed to be Spaniards? Please forgive my ignorance, but I had no idea that was the case at all.
I think the Aurorans acquit themselves fairly well, objectively, as the main antagonists of the book. Their officers and leaders are shown to be just as honorable as the Albions (keeping their word, being resistant to needless cruelty, abhorring the very idea of mistreating prisoners). When you do get a POV chapter from the Auroran's perspective, you see that they think of the Albions as complacent, greedy, and decadent. It's just that there are many many more Albion POV characters, who are subjective in their opinions, just like everyone else is.