Pros
MIT is an interesting and stimulating place to work. There are always new things happening, and employees are generally invited to become part of the community and participate in events. You will meet a lot of interesting people at MIT.
Cons
In some ways, some of the administrative departments are unstable, constantly shifting with the sands. In my time there, I had eight different supervisors and worked in four different departments, all while performing similar functions. Considering that I was essentially doing the same work in all of these departments, the working conditions varied considerably. I had both wonderful and horrible bosses. I had extensive career advancement opportunities in some departments, and felt squelched in others. MIT is not one employer, it is many, and they are all different, good and bad.