Here is my breakdown of Iain M. Banks' sci-fi novels (which include his non-M novels as well):
Classic - Use of Weapons, The Player of Games, Against a Dark Background (what I read of it, I'm up to page 175)
Great - Consider Phlebas, Matter, Look to Windward
Very Good - Inversions, The Algebraist, Feersum Endjinn, The State of the Art, Excession
Good - A Song of Stone, The Business
I always hear that The Crow Road, The Wasp Factory and The Bridge are the best of the non-Ms. It is very hard to pick my favourite, since I've never yet come accross a genuinely 'bad' book by Banks (I've had mixed feelings about The Algebraist, initially thought it was a tad overrated, but on hindsight it is actually one of Banks' better recent books and deserves another re-read to properly digest it. CP has moved up a few spaces in my personal ranking as well).
Classic - Use of Weapons, The Player of Games, Against a Dark Background (what I read of it, I'm up to page 175)
Great - Consider Phlebas, Matter, Look to Windward
Very Good - Inversions, The Algebraist, Feersum Endjinn, The State of the Art, Excession
Good - A Song of Stone, The Business
I always hear that The Crow Road, The Wasp Factory and The Bridge are the best of the non-Ms. It is very hard to pick my favourite, since I've never yet come accross a genuinely 'bad' book by Banks (I've had mixed feelings about The Algebraist, initially thought it was a tad overrated, but on hindsight it is actually one of Banks' better recent books and deserves another re-read to properly digest it. CP has moved up a few spaces in my personal ranking as well).