Pros
Beautiful campus and access to a wide range of extra benefits, like discounts at local business, access to the athletic center, the shuttle down town to Chicago, etc. The Performance Excellence program (annual review) is good, but not intuitive, and seems to take everyone hours and hours to complete. Overall, processes, well, work. I've worked at an institution where things often just went wrong because of a wide range of issues (poor planning, poor follow-through, no administrative communication, etc.). Lots of opportunity for advancement, hypothetically.
Cons
The problem with NU is that it is decentralized, so many offices are silos. This means that you don't get much of a chance to mingle or network with other offices. This is bad for personal professional development, and it's bad for the school overall as offices are not sharing information that is needed to improve. HR is kind of disorganized. I once called for one piece of information and was transferred 3 times by phone. This decentralization also leaves you at the mercy of your own office. If you work in an office that has some problems, like mine, then you are left without recourse.