While reading a list of the 50 best author on author insults (found linked on Bookshelves of Doom)I came across this gem from Harold Bloom on J.K. Rowling:
How to read 'Harry Potter and the Sorceror's Stone'? Why, very quickly, to begin with, and perhaps also to make an end. Why read it? Presumably, if you cannot be persuaded to read anything better, Rowling will have to do.
Frankly, I think Harold Bloom has an overinflated opinion of himself (as most professional critics do), and is an incurable snob. And that's really all I have to say on the subject.