Alexei Oreskovic, in a post for Reuters:
Mayer insists on personally reviewing every new recruit, a practice that supporters say brings needed discipline to the company. Critics, however, say her high standards are hampering Yahoo's already challenged ability to fill vacancies.
Marissa Mayer is in a tough spot. On the one hand, she knows that Yahoo must fill its job vacancies quickly enough to avoid a massive loss in productivity. On the other hand, she knows that simply filling a vacancy just to fill a vacancy would be counterproductive. It's good that she is adding some discipline to the hiring process in order to avoid making bad hires, but at the same time Yahoo isn't going to get very far in hiring good people if the process takes "eight weeks" (as it did for one individual mentioned in the post).
Interestingly enough, Mayer is apparently considering bringing some of Yahoo's jobs back to the USA from India (also noted in the post). That would go a long way towards helping to foster a more closely knit corporate culture. It would also be consistent with some of her previous decisions.