Harry Potter And the Cynical Cash-In (I mean Deathly Hallows Part 2). Not too bad compared to Part 1, although I don't profess to understanding much of what was going on, having read the (dull) book a very long time ago.
Voldemort doesn't come to a sticky enough end, really. You get to see Hermione's cleavage when she's dressed as Bellatrix (change one letter there and you're in all sorts of trouble; I imagine Rule 34 applies to these films).