I know this may not be appropriate but wow is she cute [1] and hot [2] at the same time. And on top of that she is brilliant, regardless of how her gig with Yahoo! turns out. Which makes her even more attractive.
Calling someone in their 30-s that you are not into intimate relationship with or hitting on them cute is indeed inappropriate.
Also her looks are irrelevant - they won't help her save the company and many of yahoo shareholders will gladly kiss Medusa if she able to increase the share price 3 fold.
I am much more worried that there is not much of her brilliance shown yet. The new yahoo homepage, while improvement doesn't seem to be able to get new demographics or fix the major problems that made me abandon yahoo years ago.
[1] http://en.wikipedia.org/wiki/File:Marissa_Mayer.jpg
[2] http://www.glamour.com/images/women-of-the-year/1103-marissa...