OotP definitely improves upon second viewing, and considering that I liked it a fair bit the first time...yeah. The things that bothered me last time weren't nearly as annoying, if only because I was prepared for them, and the good bits just got better, and I noticed lots of subtle nifty details and suchlike that I missed the first time. Still think PoA will remain my favorite of the movies, but not bad, not bad at all.
Also, memo to self: posting
fic on a Saturday afternoon is very, very silly, as no one is on LJ then.