I haven't read the books, though Im gonna make it my next books to read. I saw the movie and I loved it, but Im also biased for two reasons. First, I love films and am developing as a filmmaker, and love the themes explored in the movie as well as the direction they gave it. May not seem the epic Harry Potter became, but I think there is a certain level of "down to earth" crude aspect that helps it become a much more relevant message about today's society than simply a new universe with epic adventures you can simply escape to.
I also work in the media, specifically TV, and can definitely relate to the way it is portrayed in the film, however exagerated it may seem to some people. The way most people related to the games is so similar to how certain media people approach reality tv, for example. There is some insensitivity that you can see in the film, though taken to the extreme here.
Can't wait to read the books and see how my opinion changes or sticks. But the movie is definitely good. Comparisons to Harry Potter may come because of the need of the market to fill that void in a somewhat related way everyone waits for the next Michael Jordan. I think it does a good job establishing its direction and its own path to conquering the audience.