Oh dear. The first book wasn't one of my favourites but it had enough going in terms of the plot that I thought it was worth continuing the series to find out what happened. How wrong I was. I won't be bothering with book 3. 
 The Angst! is back in full swing, possibly even more than in the first book. Some of the characters seem to have no other purpose or goal than to be upset about everything. There's too much romance happening too quickly, instead of a focus on the actual plot, character development is non-existent for chapters at a time and then suddenly gets thrown in a big lump. The whole book feels like a bit of a cheat - the supposed conflict between Colonists and Earthborns is a big bunch of nothing, a few stray arrows with no sight of the people shooting them, then a friendly make up session with the only Earthborns they actually meet. And half of that could have been cut out if the characters hadn't been randomly withholding information from each other for no reasonable purpose. The conflict within the Colonist ranks goes round in circles and any suggestions of more dangerous undercurrents are left hanging, presumably to book 3. 
 The space-side plot also squandered all of its potential. Glass wasn't a particularly interesting character to follow through it; again she was pretty much entirely focused on her romance, and the chance to really show the conditions deteriorating and the desperation of people running out of oxygen (and, seriously, was there no one and nothing who could even attempt a repair?) was missed. Her flashbacks were supposed to show a different - deeper - side to her and at one point I was actually feeling sorry for her, but it never seemed to materialise in her behaviour in the present day. 
 In summary, I'm just bored with these characters and the story in general.