I personally never had a problem with blackstone, but then again, I saw the show before I read the books. That being saidI wouldn't mind him playing Harry's dad in the flashbacks and dream sequence where Harry talked to him.
I have to agree with Blackstone as Harry. I honestly couldn't see any of the actors on the poll as Harry, fine actors that many of them are. We all tend to cast any book with our own preferences in mind. I haven't done through all these posts yet, but I don't remember anyone casting Molly yet. And I have no idea who would work. I do have a Butters though. Geoffrey Arend of Body of Proof tv show.
http://static.tvguide.com/MediaBin/Galleries/Shows/A_F/Bi_Bp/Body_of_Proof/season2/body-of-proof-194.jpg He's even got his own Andi-he's married to Christina Hendricks- our Mrs Reynolds/the redhead from Mad Men. Only one problem. Butters is a short little guy-Geoffrey is 6'3". Sigh we just can't win.