I only noticed this comment now, I've been reading the Culture series too - I enjoyed the world building in Consider Phlebas a lot but after a while I just wanted it to finish. So I skipped on and read a few others in the series then came back to finish it.
The Player Of Games was brilliant, enjoy!
I finished Consider Phlebas on my commute - I still don't rank it quite as highly as the others but it came to life more at the end. My favourite bit was when Horza was trapped on the cannibal cult island. Completely irrelevant to the plot but some excellent wtf storytelling!