Yeah I agree with Playingwithhammers, so far these books were excellent but the lack of proper defenses and military forces that the most important planet in entire imperium of mankind SHOULD have is just bugging me constantly.
Since when Terra was reduced to nothing but militia, merchant fleets and few imperial guard regiments? The books mention a lot of forces being away from Terra and Segmentum in general, but seriously? You would expect a planet that's 10 times more reinforced and defended than Cadia or even Ultramar. Honestly can't hide my dissapointment here.
On another hand, im slowly starting to be an Ork fan reading this series. The strategy of moving the mountains and encircling the crusade was beyond epic, and the fact a new breed of orks appeared ( those three ambassadors ) completely took me off-guard.
So not only Orks have crushed Iom in physical confrotation, but they have also evolved diplomats. I couldn't help but to laugh at the irony of Orks having more sense than humans.
Also: No mention of Vulkan in this book. It looks like you guys have been really refering to one of the books' titles, rather than something in the book. Alrighty.
Makes me wonder if new Ork codex might contain few of these new surprises. I dont expect Orks to be re-written as some kind of new, serious tactical military force like they're proving to be in these books but I'm positively pleased with what I've read so far.