She's a showboat, IMHO. This is based on personal observation and insider info. She's quick to yell about how great she is, but you don't see a lot of unbiased people talking about her contributions to technology or to Google. She has her own publicist; not from Google, mind you, this is the Marissa Mayer publicist. She apparently enjoyed keeping people lined up waiting for an appointment with her for hours. To summarize, there are a lot of signs of weak character, no signs of great leadership, and no signs of greatness at all. Yahoo's board wanted her, obviously, for the name Google. They will be disappointed.