Interesting aside in Chapter 11 about Elcho Kressh, aka Kressh the Younger, establishing that he isn't the Sith Emperor in TOR and did his own thing following the Great Hyperspace War by allying mercenary fleets to strike back at the Republic with a series of agreements which dissolved when he died in a manner very reminiscent of Attila the Hun on the eve of invasion.

Ties into JJM's earlier work with regard to the Gauntlet of Kressh the Younger, explaining his fate.

I find it interesting that this swathe of Sith space is essentially the equivalent of Europe 100 years ago, with all the leaders related to each other, yet warring with each other.

"Yeah, that's right! I don't want to go to work! Come and get me!"

There was no great, over-arching storyline. There was no goal that Kerra set out with in the beginning, and so there was no real resolution. Arkadia wasn't killed, and they're not in Republic space, just heading to it. That could mean that they get side-tracked in Deluge, before ever getting there.
Another thing, not a problem, more an interesting idea: I like it when Rusher said 'I'm not a scoundrel with a heart of gold' and later when Kerra is being tortured, her first thought, that we're privy to, is of Rusher. I think it's possible that we see a Han and Leia-esque romance between them.
Now, I've heard it said that there wasn't much by way of characterization of Kerra. Yes and no. Yes, because her characterization doesn't take place in the usual sense we see in novels, and no because Miller did it in comic form, as in, letting her actions speak for her characterization, letting them flesh her out.