A (masterpieces)

The Secret Lives of Dentists
Irreversible
Dark Blue

A- (highly recommended)

Down with Love
All the Real Girls
Dracula: Pages From a Virgin's Diary
Trilogy: After Life, An Amazing Couple, On the Run
Sweet Sixteen
Once Upon a Time in the Midlands

B+ (I'd happily see them again)

The Son
Spellbound
The Hunted
The Man Without a Past
Finding Nemo

B (worth seeking out)

Manic
The Good Thief
The Italian Job
Marion Bridge
Holes
Swimming Pool
Chaos (Coline Serrau)
Terminator 3: Rise of the Machines
Suddenly
X2
Friday Night
Bend It Like Beckham
Winged Migration
Phone Booth
The Eye
Cabin Fever

B- (marginally recommended)

The Core
He Loves Me, He Loves Me Not
Sex Is Comedy
Shanghai Knights
A Guy Thing
Whale Rider
The Matrix Reloaded
Levity
Gaudi Afternoon
The Magdalene Sisters

C+ (almost-but-not-quite decent)

Dreamcatcher
A Mighty Wind
The Shape of Things
Gerry
Nowhere in Africa
City of God
The Guru
Hollywood Homicide
Lilja 4-ever
Hulk
Darkness Falls

C (mediocre films of marginal interest)

The Heart of Me
The Girl from Paris
Sinbad: Legend of the Seven Seas
28 Days Later
Raising Victor Vargas
L'auberge espagnole
Charlie's Angels: Full Throttle
Old School
Spun
Cowboy Bebop
Alex & Emma
The Recruit
The Safety of Objects
Respiro
Open Hearts

C- (almost-but-not-quite awful)

Blue Car
Laurel Canyon
Identity
Shaolin Soccer
How To Lose a Guy in 10 Days
The Slaughter Rule

D+ (awful, but with some redeeming bits)

Japon
Pistol Opera
XX/XY
Novo

D (worth consciously avoiding)

Daredevil

F (total disasters fit for MST3K)