The story started out very well, with a gripping description of the protagonist's recent past followed by a similarly strong set of scenes that established the setting: (view spoiler)[A lost-in-space, lost-in-time ship filled with mostly (war-)criminals from opposing sides; (hide spoiler)] novel, and promising. 
 Unfortunately, it completely failed to deliver. The storyline was OK, except that its sub-plots (the autosurgeon and the boarder/stowaway) went nowhere and added nothing, and the supposed major device of opposing factions was used exclusively, but repeatedly, essentially as "violence broke out". 
 Besides this lack of show-don't-tell, the writing in the second half was mostly tedious exposition, posed as unlikely self-analysis by the protagonist - to the extent that it almost read like a book report in school, rather than the story itself. That this may be on purpose is supported by the first-person perspective and the occasional "by the time you read this..." call-out, but whether intentional or not, reading it is a chore. 
 Generally, the interesting idea was let down massively by poor execution. Characters are left almost entirely without shape or definition, and everybody's actions come with almost no motivation or coherence. For example, there is violence repeatedly, mostly with little information given as to how or why it would have happened (which is fine, as it happens out of frame for the first-person narrator/protagonist), but given the clearly very difficult and violent people on the ship, the random spurts of large-scale cooperation are difficult to explain or believe. 
 This lack of motivation and coherence also follows the protagonist: she resolves her major conflict in a way that is in direct conflict with her early intentions, with no indication at all at any point that her character was developing or growing in that direction. Of course it's supposed to be a surprise twist, but that should come as an "oh! of course!" experience, not as an "er.. whut?" 
 Poorly written, and an idea that was poorly developed.