Totally disagree on Dumbledore. I'm sorry to say this of someone who's died, but Richard Harris was too old. Yes, Dumbledore is supposed to be old, but also incredibly charismatic and exuberant. I cannot imagine RH having done any of the fighting scenes in books/films 5 and 6. Gambon was brilliant. Cunning and sly, just like Dumbledore.
Agree entirely, I adore Gambon as Dumbledore. Agree that he represents much more of what Dumbledore turns out to be in the books rather than the fatherly figure of the earlier books, but that could be because as Dumbledore started to gain depth as a character the actors switched and so Gambon's DD looked dark by comparison (IYSWIM?)
Ian Mckellen was offered DD after Harris died and turned it down, I think because he was busy already being a wizard in LOTR.
Love Barty Crouch, Jr & Sr - love Bellatrix and think HBC's portrayal of slightly nuts was perfect. Maggie Smith too is perfect. Alan Rickman is good, Snape is the only role he's ever played where I actually liked him!
Didn't like Tonks or Luna in the books and didn't come round to them on screen either. Hate the pairing of Tonks & Lupin, but I did love all the Marauders casting (Tim Spall, Gary Oldman & David Thewlis).
Daniel Radcliffe gets in to the swing of it in later films but it took a few for me to warm to him (sounds mean since he was only about 4...) never liked Emma Watson's Hermione but Rupert Grint has always been superb (and without him the casting of the main trio would be really flawed IMO - he brings the other actors two up).
I never liked Dobby 
Harry's parents were about 20-23 when they died in the books iirc, so what the fuck they were doing as old codgers I don't know. Pisses me off every time they pop up on screen.
I can take or leave the Dursleys but I really like Fiona Shaw.
Personally didn't think the back in times bit with young James, young Lily, young Snape etc were very well done - found them quite jarring.
I love Clemence Poesy as Fleur, but agree the character was not the same as in the book. Agree that Ginny was very wet compared to her book counterpart.
The epilogue was a pile of depressing shite and I hate hate hate it.
Look what you've done to me. I'm a grown woman writing essays about HP casting 