I've enjoyed all the movies, including this one. I just think they're all pretty much the same. And no- I have not read the books.
I recommend them. They have far more detail than the movies and even though there is usually a set path that the book follows (by virtue of them progressing through their education) they are different enough. After all, basketball is just a game where you throw a round thing through a metal ring...
As for the 7th book (and the two movies) you're in for a pleasant surprise. It's not as formulaic.