Take the M away and he's brilliant put it in and he's abysmal imo
Again for those that don't know, the M is put in his name for his Sci-Fi which personally I find impossible to read. His "normal" fiction probably makes him Britains most talented author (again imho)
I started reading Excession about 2 months ago, one of his sci fi works and the first I'd read in his Culture series. It's a slog and a half. It's not even long. There's just something about it that makes it very hard going, I'm quite disappointed. I get the ideas in it, I can follow the story easily, I just can't quite get into it. I hit 300 pages in a week of casually reading it and since then it's been a couple of pages at a time before it gets the best of me again.
I really do agree that he's absolutely brilliant in his straight fiction though.
I did warn you... I think it's one of his least succesful ones; the ships' characters don't really come across at all, so even if you can follow the story, its quite hard to care about the protagonists.
Try the Use of Weapons or The Player of Games.