Agreed with Matt. I mean, feel free to hate Harry Potter - or anything else - but the healthier impulse is to figure out how to exploit it as a gateway drug to other better stuff. Lots of people who don't read much do read Harry Potter. That suggests they might like to read more, and read "better" stuff, if only they knew where to turn.
I managed to complete an actual novel without the word Potter in the title recently. Two thumbs up!