So I flew through this read but I'm not sure I enjoyed it. Also my first read of a Culture novel. Some stray thoughts:
-The initial presentation of Azad as a meritocracy through performance at essentially a competitive test a la the SAT, ACT, A levels, only to be revealed again and again how it's set up to enforce the class structure. Elite schooling and training to perform better, performance enhancing drugs, and just straight out blocking people from participating at a certain level.
-Gurgeh got played begining to end by Special Circumstances. This coupled with the heavy handed commentary about the utopian possibilities offered from having the same virtues as the Culture I think are somewhat at odds? Also a surprisingly high number of people die in the Culture (like at the end) after spending a chunk of time talking about how that rarely happens.