I'm a little surprised no one reached for the obvious humor here: Google spends hundreds of thousands of dollars to learn humans will create mobs.

This was such an obvious/good change to make. Viewers will still be able to use views:upvotes ratio for determining a video's popularity/worth. A mob won't want to attack that ratio because a high view count could encourage more views.

Judging by what's bubbling up on HN, I guess I'm in the minority on this one.