Social Security ranks 9th on the list of best large federal agencies to work for in 2016, which is the middle of the pack. NASA ranks first. DHS ranks last. Social Security suffered the largest decline in rating between 2015 and 2016 of any large agency. In fact, it looks like Social Security has been in a fairly steady decline since 2010. While Senior Executive Service (SES) employees at Social Security are happier than employees generally, they are actually quite a bit less happy than SES employees at agencies generally. The agency's leadership scores generally compare poorly with other agencies
By the way, all the other large agencies have cabinet rank but not Social Security.