I'll be honest, I've never attempted to read any other HP book than PoA. And that was purely because my gf at the time was obsessed and pretty much forced me to give it a chance (I refused on the first few based on their well known lack of complexity). I got a ways through it and realized that it was a waste of my time to finish it, since I wasn't enthralled by the story.
I personally don't care what the impact of the books has been, since nobody in my direct family has been impacted by them. The children in my family of age to enjoy them just don't. They're smart, just not huge reading fans yet and most of them aren't even old enough to read the books themselves. I grew up the same way, I loved reading Goosebumps because they were fun stories that didn't take forever to get through.
Now, I'm in college and thoroughly hate reading anything I've come across. I find it to be a large waste of time for me. For others, it's a well spent time. I think it's that I haven't quite found an author that grabs me like Tolkien did with the entire Middle Earth universe, or whoever wrote The Giver. My friends have tried to get me into all sorts of different authors but it all ends up with me saying they're good writers no doubt, but not something I could see spending a huge chunk of time on.
Take it as you will, I find most of my time to be well spent.
And Gene, I'm happy that you found a way for your daughter to get over her ADHD. I'm tired of seeing the Ritalin babies that America is riddled with. If your daughter really has the disorder and not just too much sugar (99% of diagnosed cases imo are bad diet and bad parenting, which I'm sure isn't the case with you and Apoc), it's wonderful you can get her to sit down and read.