I don't think it's his best. I think Atonement is way better. And I think I would have liked Saturday better had I never read Enduring Love, which I also think is better than Saturday. But I like what he does with his story. He's good about not taking the easy/expected route with stuff, even though I feel like what's missing here is directly related to the fact that he makes the book take place in one 24-hour period, which feels like an artificial constraint, like a writing exercise rather than a literary attempt.

I'll give it a B, but that's graded on a curve against his other work not against every book ever published, if you know what I mean.