Brando was phenomenal in both "Waterfront" and "Wild One." But he gave his greatest performance of all time, imhop, in "Streetcar." The only performance that rivals his in "Streetcar" is DeNiro's in "Raging Bull."
"The Wild One," despite being little better than a B-movie, is universally regarded as one of the most influential movies of the '50's, largely because of Brando. When A&E did Brando's biography a few years ago, both Dennis Hopper and Anthony Hopkins said "Wild One" was the film that most influenced them. I was 10 or 11 when it played in my neighborhood theater, and every single kid in the neighborhood was so leaped up over it that we all got motorcycle jackets, painted "BRMC" on the back, and clipped playing cards to the rear wheels of our bicycles so they would make putt-putt sounds when we pedaled.