"If there are all these books around that knock HP into a cocked hat, why don't they? Why aren't THEY at the top of the bestseller list? "
And why doesn't Norma Waterson sell as many records as the Spice Girls?
God knows how these things work. Like Enid Blyton, J.K.Rowling gets kids (and their adults) reading who wouldn't read otherwise, and she's a lot better than Enid Blyton anyway. That is something to be very grateful for indeed. Most of the time they are great fun to read, and that's more than you can say about most books.
And after children (and adults) have raced through the Harry Potter series,it's great that there are in fact so many far more exciting and engrossing books waiting for them to move on to. Some of these have been mentioned already.
Here is a page about another series that will repay attention, the first part of which has been recently republished - Uncle Stories. I don't think I'd much want to know any child who didn't enjoy these, if they had a chance to hear and read them. Or adult for that matter. (They'd definitely be naturals for Slytherin.)