Lord Lucien
Lets all love Lain
The kid who played 11 year-old Riddle was good, but not the replacement actor they got for teenage Riddle. Christian Coulson, was his name. He's 32 now, so I get why they replaced him, but I just didn't like Frank Dilane's portrayal in HBP. He felt like he was acting creepy instead of just being creepy, like Coulson pulled off.
And yeah, Snape's death and the Gringotts massacres were good Voldemort scenes. Probably because you don't actually see much of him on them. And his feeling the Horcrux destruction was a nice touch, though I maintain that his psychotic behaviour ruins him. I know he IS a psycho! But part of what made his book self so terrifying was that you didn't really get to see (read about seeing) Voldemort as much as the film. Watching him randomly kill that guy who asked him if he was alright just irked me for some reason. He wasn't the cold, detached monster, he was just an angry killer. Kinda ruined him.
For Neph, in case you haven't seen the clips:
"Avada Kedavra"
And "Nyaa-heh-heh!"