And that's a good Percy analysis as well, the Slytherin-esque behavior you mentioned. I never saw it like that before. To be honest, I always liked Percy in the first four books (I mean, he was especially helpful in the first book if not the friendliest soul, and you can understand his ambition up to that point) and, therefore, I really hope that he will do something to redeem himself by the end of the series. I was slightly disappointed by his one-line appearance in this book, but maybe it's for the best as I don't want to become any more annoyed with him.
Speaking of the Slytherins, though, does it ever annoy anybody besides me that every Slytherin (with the exceptions of Nigellus and Slughorn) seems to be a complete asshole? I mean, I can see understand that bad witches and wizards end up going through Slytherin house with the whole power above everything emphasis, but having every Slytherin be a bullying, bigoted, insulting villain just seems a little too... obvious. "Hmm, how about we put all the good people in these three houses, and then we'll put all the people who suck over here?" If it's that obvious that Slytherin=bad, wouldn't it just make sense to disband the house rather than train them up to wage war against the good guys? No wonder there'll all so bitter. I would be too if I was put in the house where I'm expected to be an ass.