Cho was exonerated at the end though -- when Snapes says he doesn't have anymore veritas serum because she used it all to question people, including Cho. So....

Yeah, it was good in some ways and not-so in others. sigh. Hope the next one's better.

Oddly, I'm completely uninterested in trying to figure out who's doing what before the last book comes out. Maybe because everyone else has been trying to.... I'm a bit perverse that way :D