Hoffman is an okay actor but he was not up to this role. He comes across simply as a nerdish failure of man and the film misses Miller's point entirely. Possibly the director deserves the blame but the film is a great disappointment. It's not worth seeing.
Compare his performance to Lee J. Cobb's tour de force in '66. Cobb breathes life and spirit into this tragic man. And the supporting cast is flawless. Frederick March did a good job back in the '51 film but Cobb IS Willie Loman. He owns the role and trying to replace him is like Steve Martin trying to be Peter Sellars. Some actors just own certain roles and Cobb owns SALESMAN.
If you're interesting in seeing this film, get the Lee J. Cobb version. It's the real thing!