I just started book II, and two details are nagging me a bit. So technically, they concern book II more than book III, but I suppose book II will be left as it is, so.
I'd have loved the portraits to be a bit more consistant (not necessarily the same, but at least a bit similar). I couldn't find in book II anything close to my book I portrait, so I ended playing with a completely different face, in a quite different way : i couldn't connect both characters, it was like a discontinuity in the story. Stuff happening to a different person. It's a tiny detail at a psychological, roleplay, level, but as it is supposed to be the saga of the same person, having them morph into someone else is a bit weird (in a george lazenby way, "this never happened to the other fellow"). Also, book I offered more skin colour variation than book II, and it was nice. The step back surprised me.
Also, the save game restriction is nice, it does add a bit of tension, but I don't understand the load restriction - when I'm really doomed, I have to exit to the main menu and load from there (or go through the the actual death of my character) instead of reloading from the game interface. Okay, it's two more clicks, and a couple of loading seconds, but it seems a bit useless to me. The difficulty is increased by the (in-game, chronological) distance of the last saved game, or is the distance to actually reach it deliberate ?
There, nothing extremely dramatic (I like the game, I don't see much else to correct, except maybe the trainers that are much discussed already - I do kinda wish that they'd have things to teach you even if you had taught yourself quite a bit already, as I always feel a bit dumb or guilty for having spent skill points that render them useless). But I warned you. The suggestions are boring. I'm sure I'll come up with a clever one after a few more hours of gaming, but for now that's really all.