The Trouble is that ranking order determines the number of views, which determines the vote count, which determines the ranking order.  This is self-reinforcing, and amplifies random noise such as the number of people who were online at the time the video was submitted.  To get a more accurate ranking of videos there are some countermeasures we might try:

0.  Introduce some randomness to the default sort order

1.  Each view of a video (from a distinct user) subtracts a small fraction from its vote count

2.  Only videos found through searching or "random" mode can be voted.  If a user arrives at a video through a top-list, he cannot vote for it.  Videosift doesn't have enough traffic volume to try this approach, but YT does.