*Warning Memento Spoilers*
Yeah, Memento was really good, first you think that Teddy is the bad guy, then you think that Natalie is a bitch, but then you discover that they are just victims of Leonard. But I guess they deserve what they get, and Leonard is a psycho, he knew what he was doing when Teddy told him the truth, and his statement at the end just reveals how far gone he really is. It's a great movie. It's like watching a movie from end to beginning, really original.
Movie quality is too subjective and relative to pick a single best-movie-ever. But here's a few of my personal favorites:
2001: A Space Odyssey - A Clockwork Orange - Alien - Apocalypse Now - Army of Darkness - Blade Runner - Conan The Barbarian - Dead Man - Dobermann - Dr. Strangelove - Fargo - Fight Club - Full Metal Jacket - Interview With A Vampire - Lawrence of Arabia - Lock, Stock & Two Smoking Barrels - Man Bites Dog - Miller's Crossing - Monty Python's Life of Brian - Monty Python and the Holy Grail - Monty Python Live at the Hollywood Bowl - National Lampoon's Vacation - Oh Brother, Where Art Thou? - Pulp Fiction - Reservoir Dogs - Robocop - Raiders of the Lost Ark - Seven - Spartacus - Stallingrad - Star Wars, Episods IV, V, VI - Starship Troopers - The Good, the Bad, and the Ugly - The Terminator - The Big Lebowski - The Blade - The Matrix - The Usual Suspects - This Is Spinal Tap - X-Men
There is no way I can pick a single one of these as the best, but if forced, I might be able to narrow it down to about a third.