Thankfully I rate every film i watch as my memory is so bad I'd end up watching the same dud on a loop if I didn't. The only films I've ever given a perfect 10/10 are below and topically enough, three of them are Japanese:
A Touch of Zen - (long and slow old kung fu flick, completely sucks me in and has an awesome last 40mins or so that makes me feel strange)
The Sting - (speaking English is no barrier to movie perfection. I remember actually laughing at how this film just nails everything)
Hana-Bi (aka Fireworks) - written, directed, acted in and featuring paintings of the "Japanese Chris Tarrant" (Beat Takeshi of Takeshi's Castle). This guy is a complete one off. I'll file it under 'drama'. Some of his other stuff is great too, albeit overly similar.
Akira - (best animation and music in a film ever, hand drawn. Can be hard to follow without reading the manga or having repeated viewing - essential for any 12 year old boy who likes sci-fi or dystopian settings)
Dersu Uzala - (favourite Kurosawa film - modernity hits rural Soviet Russia. Also long and slow.)
Some other snorters that I gave 9/10 (focussing on English language films that aren't super old, to make this even remotely worth reading):
Miller's Crossing - (my favourite of the Coen Bros)
The Game - (my favourite Fincher, accesible too)
The Pledge - (overlooked Jack Nicolson crime effort. Directed by Sean Penn and not well acclaimed at all. I thought it was superb)
Wicker Man - (what a bloody awesome musical. They should show this at school instead of West Side Story.)
The King of Comedy - (my favourite Scorsese / De Niro)
Night Crawler - (my favourite film of this decade so far)
12 Angry Men / Anatomy of a Murder (joint best legal)
Terminator 2 (best English language action blockbuster type thing)
View any of these at your own risk as they wont be for everyone. No dubs allowed for foreign language.
(PS - I just noticed I didn't like Friday Night Lights as a film, but the book is top drawer. I'm surprised it gets much love as it is pretty scathing about society if I remember right).