Sam Fuller is a pulpy director, but that's not a problem when it's fun. The issue with Pickup on South Street isn't even necessarily that it isn't fun, I suppose. The problem is that his 1953 "spy" film is just poorly written with character motivation poorly defined and the characters themselves not defined much better. Fuller wrote it himself, so I can't let him off the hook here, but it's still a beautifully shot film and he's responsible for that aspect as well.