Pros
Known brand. Pockets of good people as you'll find at every mid-to-large size company. You can rationalize that you're helping people as you walk in the doors each day. If you work under the right circumstances, it can be a good existence, e.g., remote employees who don't need to face commuting time or expenses.
Cons
Hijinks and arrogance start at the top. CEOs eventually fall out of favor, and provide for "you can't make this stuff up" type of stories. The only one from the outside lasted less than a year, and was the only one that would make eye contact, smile, or engage much with the rank & file in the hallways. Executive ranks have always leaned heavily towards having to show both employees and customers that they are the smartest in the room. HR is squarely in the transaction business. Mediocre health policies, e.g., maternity leave, for such a well-known health company. Tough place for a middle-manager to come in and crack successfully. Ten-plus company values are posted but you'd be hard-pressed to find anyone that can off-handedly name even a couple of them. A 'morale' committee was formed several years ago but disbanded due to lack of morale. Supposedly there is robust attendance at "WebMD Survivor" parties that occasionally happen. A certain cluelessness is exemplified by this occurrence, when a politically-incorrect comedian was once flown down for a sales meeting to roast a sales executive about his arguable interpersonal shortcomings.