There. I've said it. Book seven of the Harry Potter series sucked.
1. Harry is an ingrate, allowing Hermoine to wait on him hand and foot for months while sleeping rough and fleeing the death eaters. A little thank you once in a while isn't too much to ask for.
2. Why the chapter after chapter of them wandering around England without any purpose or goal?
3. They just happen to camp next to a couple of goblins and old friends so they can overhear some plot-advancing info. You'd have to be a billionaire to get away with that coincidence.
4. The deadly hallows vs. seeking out little bits of he-who-I'm-so-tired-of-having-to-hypenate-around. I felt like I was watching a late-night commerical; "But wait- there's more!" plot devices to confuse the reader and require endless backstory.
5. The King's Cross scene. Let's stop right in the middle of the ultimate battle for a chat and a spot of tea, shall we? Now here's some information key to understanding the plot that I couldn't think of a better way to relate.

To give the author her due, I was taken with the way she gave Dumbledore human flaws, and enobled Snape while remaining true to his character. If I were workshopping this book, I would have probably said it was a great first draft.