Unknowable, creepy, indefatigable aliens with undefeatable technology. Rival, duplicitous factions lusting for artefacts and/or power. A set of characters that have been slowly honed over a couple of thousand pages into essential three-dimensional, vibrant people. Revenge, adventure, all out war, philosophy - it's all furnished so effortlessly and is never predicable.
I bought paperbacks of all four of these books, because they're now the sort of books that you can pull off the shelf, open randomly, and just start reading and it's like toasting marshmallows on the fire (that's spewing from a rift in inter-dimensional space).
6 out of 5 stars, 11 out of ten.
More please.