When you are on Questions tab and click on "votes" tab you will see questions sorted by upvote. Is there any way to do other way round. I know no one want to see questions which are downvoted but there is no harm in looking at them(or stack overflow having a feature to view them in reverse order of voting) and try to understand why would questions be down voted.
If you sort by score (which is what "votes" actually means) and then go to the end of the list you'll see the posts with the most negative scores.
These do tend to be the most heavily down-voted posts though.