I really like what Stephen King had to say in this article he wrote. I always marvel at his insight into things (most anything he writes about actually).
http://www.ew.com/ew/article/0,,20044270_20044274_20050689,00.html
His comments about the reviewers of the Harry Potter books is pretty much spot on. I also believe that Pottermania has changed reading (as a whole (by kids as well as adults)) for the future. I like that there are books with substance, longevity and plots that make the reading ... worth reading.