Right. Have seen the film, and read all the books in the past week, so now can fully comment. I do agree with Leowind's analysis of the novels as absorbing, entertaining, and well written. Compared with a lot the so called childrens fiction that is foisted upon young readers in this day and age, it is a veritable gem.
The books are not without faults, and I wouldn't go so far as to yet call them masterpieces on a par with the Ring cycle (

), but, I will withhold that part of my judgement until later. In the latter books, however, Rowling does fall down a bit in the workings of the stereotypical love interest scenes, losing the innocent charm that it earlier had. If she avoids going too far down this hackneyed path in the next novels, the series will continue going strong. Counterbalancing this is the amusing portrayal of youthful political awakening and idealism in the crusade of hermione on behalf of the unwilling house elfs.
Overall, they are well structured, well written pieces of work that appeal to children and adults alike.
(And what is wrong with a public school for wizards? Nothing wrong with that system, me old mucker, keeps the poor in their place

)
As to the film, I was impressed in how faithfully it held to the text, not only in character and setting, but also the thematic concepts that made the novel a success. The adult cast were all terrific in their roles, with Harris, Smith and Coltrane particularly notable, and John Cleese in a very short cameo was amusing. The child actors were quite remarkable in their mature portrayals of somewhat complicated characters, and did not really slip up into basic acting errors that are frequently observed of some performers of that age.Daniel Radcliffe in the title role did Harry Potter utter justice, combining wide eyed wonder, touching innocence and vulnerability, and wit with an inner steel and intelligence.
Therefore, one could be described as somewhat of a fan, having originally mainly been motivated to see the film because one will probably end up teching the book in the next two years or so, but this evil, hard bitter man was won over by a combination of childish innocence, wonder, and a free upgrade to a large popcorn.