I was a 70s child and loved and still do love Alan Garner, Diana Wynne Jones, CS Lewis, Tolkien, Tove Jansson - all the fantasy greats.
This little girl loved battles, swordplay, monsters, horses, fantasy landscapes, magical creatures, spaceships, robots, pirates, aliens, Vikings - and this big one still does.
So when Harry came along and I was already middle aged, I jumped in and love the whole world.
I feel the earlier books are better written, tighter, less inclined to go off on a tangent.
As the series and the book size grew, I do think quantity won over quality in the writing style.
Having read the lot aloud recently, there are some interminable, clunky, exposition-heavy passages that are something of a challenge to bring to life in the later books.
But the imagination, world-building, characters, relationships etc are captivating throughout (Eng Lit grad hat on here).