It's a typical Stephen King story: absolutely outstanding until right near the end, when it just nosedives. He just can't write endings. He even
admits that it's not a very good ending, but just says that he couldn't think of a better one.
The first five books are amazing - I particularly love the third one and the flashback stuff. The sixth was, I felt, just starting to get a bit silly - stretching the bounds of credibility and introducing too many elements.
Spoiler I thought the human-animal hybrids were just stupid and the literal author-insert bits plain jarring.
The last book just isn't particularly good. It's like he completely ran out of ideas and was just trying to wrap everything up, but in spite of some hamfisted attempts at
drama it doesn't engage emotionally and the ending is just rubbish - especially the totally lame and pointless final confrontation. Also, way too many characters that don't really do anything and don't need to be there. He really could give Tolkein a run for his money.
I'll stand (or should that be Stand?) by the first five books, though. I'm sure I'll re-read them at some point, and the first book is great.