I'm on 2312 now also and 50 pages in or so, I'm really enjoying the world(s) KSR is creating. The writing style is dry but I like that.
I guess that's the difference - you like the writing, you probably will like the book, but for me the lack of enjoyment of the writing was too much and the book felt empty - I could go on and on why the characters and settings seemed totally unreal; this is the last KSR I will ever open since if not even the interesting topic of 2312 made the book more than meh for me, there is no point in trying the writing style of the author again
Back on topic, I finished
Harmony (alt.human in the UK) by Keith Brooke and I was a little mixed again, though i definitely liked it more than 2312 and I really enjoyed the frantic first person narration and the final twist, the book had an adolescent feel to it for large parts and it was pretty minor as sf goes since I've seen its themes treated in an adult way much better
It's a Fermi paradox book, though in this case instead of "where are they", they (ie the aliens) are everywhere and the humans are sort of serfs/pets restricted to IPP (Indigene populations preserves) ghettos where they live at the will of the powerful aliens who may - and do - kill them at their whim
Dodge, a pid runner (every human has personal id device nanos in his/her blood stream, who define where the human can go, and the local gangs into which the humans are generally divided found how to fake it) is involved with the saving of 4 human refugees from a destroyed city and later with the mysterious girl Hope whom he saves in the process, try to find the rumored last refuge of humanity called Harmony...
Very engaging style but minor sf