[This was the review of “Harry Potter and the Philosopher's Stone” I posted on June 8th 1999, shortly before the release of “Azkaban”.]
It's been quite a while since I enjoyed a previously unread children's book as much as I enjoyed HP&TPS. At first, the book did seem to skip through genres quite jerkily: I think the introduction, an ugly-duckling story as with the start of, say, James and the Giant Peach, was a bit too long for a section so separate from the rest of the story. But the mystery part was excellent and I never guessed the secret. (It's an interesting point that there's no way you can be really evil if you have a stammer.) Considered as a school story... I'm not sure I can tell: the conventions for stories about boys' schools and girls' schools are so different, and good stories (such as this one) about co-ed schools are correspondingly so rare. Perhaps this is just my limited experience.
Incidentally, I wonder how much she was influenced by DWJ. The idea of the Ministry of Magic is very similar to Chrestomanci's department (though with different motives); you could perhaps draw (a few) parallels with Witch Week.
The description of the first few days at the school did get slightly irritating, because your attention kept being summarily drawn to a rapid succession of things which were (or seemed to be) just for show, without any obvious use in the story (e.g. the Choosing Hat): it was rather as though the author had invited you over to show you her holiday snaps. This is one of the places where I'd draw unfavourable comparisons with the subtle way DWJ has of doing the same thing; nevertheless, there are lots of good little ideas used well, with Diagon Alley and the Every Flavour sweets being especially memorable.
A few oddnesses: I'm sure Hermione's logic puzzle has more than one solution. The bizarre HM turned without warning into a bizarre moralist beside the Mirror of Erised (though you could draw comparisons with his behaviour by Harry's sick bed). Quidditch was rather run to death. Were there really no half-decent people in the whole of Slytherin? And by the way, I'm fairly sure I remember reading in Brewer that the Philosopher's Stone was pink and crumbly, not scarlet... hmm!
But it's also been a while since I've slowed down towards the end of a book because I know I'm going to miss the characters (cf. the Neverending Story). So I think I'll look out for the sequel... besides, I want to know whether Harry & Hermione get together :) . I'll certainly be recommending this to people I know who are sensible enough to want to read it.
[And a small claim to fame: AFAIK I was the first person to try to create a Harry Potter newsgroup.]