Good thing: Disliking Harry Potter as I do, I've now acquired some empathy for anyone on the forums who hated Transformers but had to sit through it. I know how you feel now, and even though we might have different tastes in movies (ie: you love Harry Potter but hate TFs, I love TFs but hate Harry Potter), we can all rejoice that these two movies are now behind us. May there be peace on the boards in time for the holidays!
Bad thing: I had to watch Harry Potter after years of scrubbing the book from my brain.