I felt this way some, particularly about Ch. 108 which was a lot of "tell me instead of show me" exposition, but EY has a lot of promised explanation to get out of the way and I kindof gave it a pass on that basis.

It was unsatisfying that the magical details of the interactions between Quirrell and Dumbledore seemed to come out of nowhere, but I think we need to keep something in mind: we are following this story from Harry's viewpoint. You could fill a restricted section of the Hogwarts library and then some with magical things that Harry doesn't know. It might be unsatisfying to the reader to have these two powerful wizards planning around eldritch magics we've never heard of, but that's how the reality of it would be.

The last few have been a rollercoaster (not in quality, but as an experience), and I'm kindof waiting to see how it all goes to make any judgments. Certainly my expectations have been set high by this series, and I do have a little worry that they might be too high. I don't know if I can think of an ending that would satisfy me, but I'm hoping that EY has.