Consider Phlebas
The Culture Series in general and this book in particular came very highly recommend.
Honestly, having finished it yesterday, I don't know what to think of it.
On one hand its got some great ideas that are as fun to think about as they are to read. A post-scarcity society and their interactions with other civilizations is an awesome concept. Orbitals, Minds, Drones, Sublimated Races, all pretty cool stuff.
On the other hand the plot and pacing are seriously all over the place. There are entire sections of this book that could have been left on the cutting floor as they do very little to advance either the plot or ideas. This annoyed the shit out of me for some reason. I put the book down for weeks at a time before coming back and eventually finishing it. Banks is clearly a very smart guy, but IMO he isn't a good enough writer to give meaning and purpose to some of these lesser sections of the book.
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I'm pretty torn whether or not I want to continue with the Culture series for essentially the two reasons I brought up above. I'm sure his other novels have great ideas, but I'm worried his writing style may not quite be for me.
Has anyone else read these? Any recommendations on another one to try? It looks like there isn't a need to read them in any particular order.