Spoiler Space
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What's happened to Harry's "power level"? Look at the Snape/Harry duel. Forget Snape's motives for the moment - what is clear is that Harry is completely outmatched. What's all that about? In previous books, Harry has been, if not Snape's equal, certainly no pushover (c.f. pensieve scene in OotP, Harry knocking Snape unconscious in PoA). Plus he holds V to a draw in GoF and holds his own against Death Eaters in the climax to OotP. Heck - in HBP he only manages to beat Malfoy due to a lucky spell he found in a book. The whole "silent spelling" thing is completely out of the blue as well - nary a hint of it in the past 5 books. (You could retcon it by claiming "yeah, but if someone did a silent spell in a prevous book we wouldn't have known about it", but it's still a retcon).
Let's face it, on current standing, Harry has about as much chance of completing the tasks of book 7 as Hermione has of failing her NEWTs!
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