Naked (1993) - ★★★★★ - pretty much THE most important British movie of the past 25 years.
Tokyo Fist (1995) - ★★★★☆
Thirst (2009) - ★★★★ - Park Chan-Wook is seemingly incapable of making a shitty movie.
Last Days (2005) - ★★★☆ - Seems to be underrated mostly due to butthurt Nirvana fans taking the Kurt Cobain's suicide inspiration behind it too seriously and finding the whole thing disrespectful. Others probably just got bored due to the minimalist style and bleak themes Van Sant was utilising at the time. Nonetheless, I found it a pretty good meditation on depression.
Johnny Guitar (1954) - ★★★
Saturday Night Fever (1977) - ★★★