I don't think he'll save the world, that duty goes to Annaig, Glim, Sul and maybe Attrebus. He may save The Mede Empire, though. As for the rest, I think every character has merits on one hand and problems on the other, as it should be. Annaig does spend a little too much time either too facinated by Alchemy to really help anything or too busy fantasizing about Attrebus, but she looks to be getting her [censored] together. Glim is fun because he is a random passer-by, the "average man" who just wants to live a peaceful, safe life but is caught up in a all-too-real playout of their friends heroic fantasies. Sul is all determinator, but he's only a few words away from a total breakdown (in a good, in-character type of way, of course), and Attrebus, well I could go on for a while about why he's a good character because of how bad he is.
i meant "world" loosely. either way, he is still uncovering a vast conspiracy from the inside, and finding out that he appears to be the only decent person left. only smart person, too. i suppose it depends on how its handled, i enjoyed most of what little action he got, but the end just had me dreading what sort of cliche he could become.
What bothered me with Annaig (and I go at length about this in my forthcoming chapter-by-chapter) is that what she is supposed to be and what she is often contracticts itself, especially in the early chapters. She is presented to us as an action girl, independent, charismatic and able to influence others. a natural leader, though reckless. However, she isnt this beyond the first chapter. All of her decisions are very minor and in the end inconsequential, whenever she is involved in something that actually matters she is completely helpless (crying or throwing up, usually) and lets herself be carried by the situation. Now, it could be argued that its all valid characterization, i didnt get that it was on purpose, if it was. it struct me as a difference between what she was intended to be (strong female lead who has the potential to save the world) and what she really is (weak female 'lead' quite enjoying her time on umbiel and still needing to be saved).
many of what i perceived to be problems could have been handled by giving the book more pages. most of it is action, with little transition between. when we do get normal, rather purposeless conversation or description it almost feels awkward due to the way the rest of the book is packed. relationships between the characters (attrebus and his guard, glim and annaig, attrebus and sul, etc.) needed a whole lot more to be believable. I didnt feel sorry for black marsh or angry at vuhon or anything, because we were never really given enough information to develop relationships with the characters and the setting. we dislike umbriel simply because we are told to dislike death, not because we cared for anyone or anything that was killed. Annaig and Glim are much of the same: they go through the motions, but I do not see the actual character motivations behind them.
[edit] over all, i did like the book. it wasnt the best fantasy i've ever read, but it wasnt horrible either.