Of the
very few I've seen, most have been horror movies, suggested/shown to me by a friend. "
Honogurai mizu no soko kara" (aka Dark Water), was particularly good. He bought it on DVD after seeing it in London a little while ago now.
It took a while for the film to sink in... while watching and straight after it wasn't as "tense" as I hoped it would be. However it did leave a lasting impression (Ringu was the same). Quite different to most western "horror" films I've seen, which go for the short term graphic violence that becomes dull and repetitive after a while.
I wouldn't say it's the best Japanese Film, mainly because I've not seen anywhere near enough... Still a good watch if you like creepy horror movies (a genera a number of Japanese directors seem to understand very well).