The bandwagon effect (which is just ridiculous on reddit) occurs because top-rated comments stay at the top. Typical reddit comment at the top of a thread:

  reddit_user 622 points
 
  Glenn Beck is a wanker!  He sniffs arses!

Everyone agrees with this, needless to say, but they only upmod it because it's at the top of the pile. Otherwise, it's a worthless comment. I find the lack of mod points distracting to an unexpected degree. Bad quantification is better than no quantification...