Board Thread:Consensus Track/@comment-25075055-20140203153514/@comment-10353597-20140208163259

 Quoting Wikipedia's definition of a lead, " The  lead section   (also known as the  lead ,  introduction   or  intro ) of a Wikipedia article is the  section  before the  table of contents  and the first  heading . The lead serves as an introduction to the article and a summary of its most important aspects. "

Emphasis on, "A summary of its most important aspects", it should definitely have all of the important stuff in the lead, so it shouldn't be too short, however, it shouldn't have anymore than that.