Biff says about Willy that "he had the wrong dreams. All, all wrong." ("Requiem") Was Biff's assessment right?

Biff was correct in his assumption that Willy's dreams
were "all wrong". Shortly before Willy's death, Biff began to experience an epiphany in
which he realized the extent of Willy's fantasies and the effect they had on him. He
noted that Willy lived a life of self-deception and false ideals, always chasing after a
victory that Willy himself could not fully describe. Furthermore, Biff knew that his
father's talent would have been better invested in chasing after the things that he
really loved, which were nature, the outdoors, and building
things.

In addition to this, Willy did not become a
salesman because he wanted to become one. Instead, he did it because he once heard that
a man named Dave Singleman had become successful as a salesman. Therefore, Willy was
trying to repeat the success of another person, and did not try to go after his
own.

This is also why Biff's assumption that Willy's dreams
were all wrong is correct. Not only was Willy not going after what he loved, but he was
also going after the dreams and successes of someone else.