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The epilogue there was just a huge wankfest for the fanboys and girls. 'Harry married Ginny! Ron married Hermione! WANK WANK WANK'. Couldn't she at least gone into a little more detail about the immediate aftermath rather than just the one throwaway line? I mean, the whole 7 books have been working to this point (of Harry vanquishing Voldemort) and she spends arse-all time saying what happened after.
Also, Rowling. Short sentences create tension! This only happened like once, with 'THE MINISTRY HAS FALLEN. SCRIMGEOUR IS DEAD. THEY ARE COMING.' One of the best things I've ever read in a book, but then every other sentence has like 3 commas and a hyphen or two in it. Quite a few of the sentences were poorly structured and I seem to remember a couple of typo's, so maybe they rushed it to get it ready for the July release? That could also explain why there was nothing about the immediate aftermath.
Also, she should learn how to write character's deaths and make it more epic (this goes for everything else too). Dobby's was okay, but everyone elses was just 'Oh, look, Lupin/Tonks/whoever is dead' and then a page or two later 'Harry's heart ached for Lupin/Tonks/whoever'. Again, short sentences. The same could be said for the Hermione/Ron kiss. It's been hyped up for ages and then it's just 'lol, they kissed. WANK WANK WANK'.
She seemed satisfied with just name dropping old characters and tying up loose ends in a couple of lines. For fucks sake, Rowling, people have been waiting for the ending of the series for ages and you make it as anti-climatic as possible.
Overall, yeah, it was pretty good, but it could've been so much better.