Well Chris I think was the best choice to ease the cast and everyone into the process, he was known for making family films, and there were tons of children on set, so I think he was the one to sort of lead the way. I was honestly not fond of POA, I felt there were some decent plot points that were also left out, especially A LOT of the backstory of the Marauders. (And I seriously wished we would've seen Snape completely lose it over Sirius's escape!) GOF was a step up, but the last three films have left me utterly disappointed, especially OOTP.