I've seen it today, after watching the first 7 movies the past 2 days. Yesterday I did the 4-7.1 without a break.
It was good. I liked how in the later movies they started to focus more on the characters and less on the one-off magic tricks and artifacts that have no connection to the actual story at all.
I think I liked 7.1 best, second place is shared by 7.2 and 6. Because, like I said, they had a lot of character development. And to me, character development is king when acted by great actors.
Oh, and I didn't read the books.