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The book is much better, by far.
Regarding the topic:
The epic siege of Hogwarts didn't impress me, either at the beginning or later on. I mean, the premise was worth 100 rubles, but the battle itself was only worth a penny. It felt like a watered-down battle; there were no flying creatures, everyone was just walking around on the ground, and I was hoping for dragons, harpies, battles on broomsticks, and all of that in one package... Out of 5, I'd give it a 4. (I haven't read the book.)