I found it pretty easy to rank the nominees this year, in this order:
They were all very good, mind you, and I may well nominate them all for the Hugo.
- Ancillary Justice, by Anne Leckie
- Evening's Empires, by Paul J. McAuley
- Ack-Ack Macaque, by Gareth L. Powell
- God's War, by Kameron Hurley
- The Adjacent, by Christopher Priest