I LOVED this chapter. Luna's tormentors get what they deserve and the teaching staff is more concerned with what happened to the perpetrators than to the victim.
When you look at the problems in the wider wizarding world of Britain, you can't escape the conclusion that Hogwarts is the place where a lot of these problems start. Sure, the first 10 years are spent with their parents, but Hogwarts only reinforces that one rule: you never have to face the consequences of your actions.
So yeah, I loved this chapter.