Has the valley ever seen a more hyped, yet disappointing hire than Mayer?
Carly Fiorina? As per Wikipedia: "several commentators ranked Fiorina as one of the worst American (or tech) CEOs of all time" Then as a punishment for being a shitty CEO: "In 2010, she won the Republican nomination for the United States Senate in California; " Overall she looks like at least a good challenger to Myers.
Fiorina, on the other hand, caused active damage to HP and had at least some role in the evolution of what at least became probably the most dysfunctional board in a large tech company ever.