I think it was pretty good. It wasn't perhaps as creative and innovative as some of the others in the series, but I think it was a good story very well told with a high level of entertainment per unit of reading effort.
Bottom line: I heartily recommend it. I'll bet that the vast majority of the 10,000,000 people who bought it and read it in the first 24 hours after its release weren't too disappointed.
*Did you know that 47% of all statistics are made up on the spot?