I'm just annoyed Biden isn't taken more seriously.
Biden has high name recognition and consistently bad poll numbers in presidential polling, so perception of him is already baked in and not in a good way. In 2008 he got 1% in the Iowa Caucuses and then dropped out. There isn't a reason to take him seriously.
Biden's name recognition is a lot lower than Hillary's. And in voter familiarity with Hillary and him, the disparity is even wider. Also, there's a better explanation for his poor polling (both in 2008 and now) than what people think of Biden himself, e.g in 2008, his competition. In 2014, his boss and his balls.
If Biden performed so poorly in the 2008 Iowa Caucuses because of his "competition" then that is essentially an admission he was a weak candidate. He finished behind Obama, Clinton, John Edwards and Bill Richardson.
As far as his current numbers, if he was only polling badly vs. Hillary that would be one thing. But he looks mediocre against a lot of other potential opponents as well and as the sitting Vice President he has much higher name recognition than they do.
The Vice President has admirable qualities but his numbers are what they are. And that is a huge red flag in terms of him getting the nomination.