Glassdoor is a site that allows employees of various corporations to rate how they think their management is doing (while remaining anonymous), and the company has shared some info with TUAW that it says comes out of Apple's campus in Cupertino.
The site works kind of like Yelp for employees, as users can come along and leave ratings and reviews for their own company. But presumably this information came from anyone who works for Apple, not just the employees that work directly with CEO Tim Cook in California.
And what's the word? In short, they love him. Cook has never had anything less than a 92% approval rating since this time last year, and his current approval rating sits at 93% among employees leaving reviews on Glassdoor. During his time overseeing the company, Steve Jobs held a 97% approval rating, and Cook is a few points below that, but still -- Apple employees think he's doing a great job.
Glassdoor also shared a few comments from users who identified as employees actually working in Cupertino, and they called Cook "a CEO who demands work before 6 a.m. everyday, and 'accountability without control'." Another engineer from Cupertino said that "no work/life balance is to be expected at Apple," and that management required employees to be "reachable after work hours." But despite those extra requirements, employees in general seem like enjoy Cook's management.
Obviously, these reviewers are all basically self-selected, and like Yelp, this is not exactly an objective look at exactly what the entire company thinks of how things are going over there. But as far as this data goes, it seems like Cook has the support of his employees, and those choosing to report from inside Apple are happy with where the company is at.