Pros
If you're in a super-specialized position/department, perhaps your life won't be as miserable as ours was. I can't even really name any pros that outweigh the cons, it's just not worth it. I guess some of the big savings and clout that come with large corp. settings may be kind of alluring to some, but again, not worth your mental well-being.
Cons
Speaking of heath/well-being, it's quite ironic that working in health insurance is when you can surely expect to suffer the most physical and mental anguish of your life (if you're in the wrong department, I cannot speak for everywhere.) I cannot even begin to put my misery into real words. I used to cry almost everyday after working as hard as I could all day because of the amount of tension and stress in the office. I am at a new job now, also in a big corporate setting, but it's light-years better. I often feel like I just got out of an abusive relationship and I am still adjusting to normalcy. I could list endless examples but I would just say to take my word for it and the other negative reviews too. ALL OF THE GOOD REVIEWS ON HERE LOOK FAKE OR SEEM TO BE COMING FROM THE FEW AREAS THAT AREN'T AS MISERABLE.