I agree that Gambon hasn't been doing a lovely job in taking Harris's place, but I don't know about Robin Williams. And, for those who have given you negative feedback, it's your opinion and you're entitled to it.

I'm not going to sit here and bash you, because I know it's immature and stupid, but I have to disagree with you here. Tom Cruise is honestly not fitted for the role of Lupin, and that would just add up the fangirly-ness in the Harry Potter world. Lupin isn't supposed to be a heartthrob, he's supposed to be loving, brave and brilliant, and a bit shabby.