I dropped In Flight a few chapters ago, when it became rather clear that the author didn't really have any clear direction for the story as a whole. I think I've mentioned it before, but at the beginning, it seemed like In Flight was going somewhere, and that gabriel blessing had some clear idea of how he wanted to end the story.
His shorter works don't really suffer from this problem, but it seems that he's simply not as skilled at writing longer stories. Looking at the evidence, Hill of Swords had a relatively abrupt (and rather unsatisfying) ending, whereas his shorter stories (like the two Bakemonogatari crosses) fit together much better as a whole. In Flight is a much longer work than Hill of Swords, and it seems that the flaws that were inherent in HoS have been amplified. That's not to say that it doesn't have its merits, but, at this point, the few redeeming qualities that it does have are, by and large, outweighed by the negative aspects.
If I had to compare it to something, I'd probably say that gabriel blessing's works are kind of like mixed drinks. Think about something like a vodka and cranberry or a screwdriver. If you forget to mix it properly, then, the first half or so is fairly pleasant, and then when you get to the bottom, it gradually gets worse and worse until finally you're basically just drinking vodka with a little bit of sugar mixed in.