Paul, I agree with Greg. I don't think you can judge the course's difficulty based solely on the scores this week. The wet conditions made for easy pickins for the pros. Last year the winning score was -16, which is the same score that won the Players Championship this year and I don't hear anyone saying Sawgrass is too easy. In my opinion, Sedgefield is like most tour sites. Under the right conditions, it can be set up to play hard. But the pros can exploit almost any course that isn't fast/firm.
Matthew, I think the front and back nines are actually pretty equal. 11, 13, 14, 15 and 17 are all really good holes on the back.