On the upside, Biden is an old Washington hand, he has foreign policy experience, he's feisty (which is a good trait for a VP), and he's a better speaker than people give him credit for.

On the other hand, he doesn't deliver a state to Obama, he's extremely liberal, he's a real blowhard, and he's primarily known for plagiarism and gaffes like,

"I mean, you got the first mainstream African American (Obama) who is articulate and bright and clean and a nice-looking guy."

and

"You cannot go to a 7-Eleven or a Dunkin' Donuts unless you have a slight Indian accent."

All in all, Biden is probably an inferior pick to someone like Sam Nunn or Hillary Clinton (who would have delivered a lot more votes), but he will help balance out Obama's inexperience, naivete, and lack of competence, which is what Barack desperately needs right now.