I like Big Joe. Earlier I was hoping for Jim Webb, but he took himself out of the running. So, good choice. I have no complaints.
The criticism of Biden that I've seen so far (and this is just from a few hours of the news being out) do not focus on Biden (he's hard to find fault in), but on Obama.
The same people who two weeks ago were saying that "Obama needs to shore up his outsider status and domestic policy expertise with somebody who knows how Washington works and has foreign policy expertise" are now saying "This shows Obama knows he's weak, and is really another DC insider."
Look, these people were not going to approve of Obama's VP choice, no matter who it was. Another outsider would have been criticized as lacking experience or depth. Another minority or a woman would have been criticized as "asking for too much" or "insulting the mainstream."
Senator Obama did the right thing by "balancing the ticket" - something every nominee strives to do, no matter the party or situation.