By the power of truth, I, while living, have conquered the universe.
Posted by: Techno Greek
To me, only the ones by Eric Nylund matter.
The Fall of Reach
First Strike
The Ghosts of Onyx
Because answering the OP's question is too hard without including your opinion. Why are Nylund's novels the only important ones when Contact Harvest was written by Joseph Staten and the Cole Protocol was very well written by Buckell?
The Flood wasn't bad either, the extra sections brought in some variety so it wasn't just focused on the game.
Evolutions was fantastic, as was the Graphic Novel and Cryptum - and Greg Bear is 50 times that author Nylund is.