Looking back, the Dems put forth a smorgasbord of terrible candidates in 2016. The fact that Bernie even had a chance at the nomination really tells you just how poor their pool of candidates were. Biden isn't great either, but he's considerably better than HRC is regards to winning the election. Doubt he makes a great Prez. Hopefully he can hold serve til 2022 and we can get some actual quality candidates from both sides.
It's crazy to think where we are now after all the quality candidates we had 8+ years ago. Mitt Romney wasn't an amazing candidate, but if he were the Republican nominee right now, I think it's pretty clear he'd be running away with the election. 2008 was a great race, minus Palin. Even John Edwards was a popular Dem candidate before it was revealed the scandals broke about his dying wife (and the following scandal about using campaign funds to cover it up).