Joe Biden makes a fool of himself frequently and shows why he should not be the vice president, however this is the intention of having him as VP, it makes light of Barrack Obamas failures. In comparison to Joe Biden, it is easy to think that President Obama is an excellent president, as Joe Biden is dismissed by the politically aware and taken seriously by those unaware. He plays a unique role in which he is both a leader, backing up Barrack Obama, and a buffoon not to be taken seriously. Joe Biden is only influential to those without political awareness.
Biden is a good politician and has used his voluminous experience to augment Obama and give meat to his goals and objectives.
However, no one will come close to wielding the amount of power in the VP slot as Dick Cheney did, if for no other reason than Bush being something akin to the "absent in Chief". There was an evident power vacuum, and Dick Cheney filled it.