Pros
I was employed 9.5 years there as a software developer. In terms of technology, Nationwide is top notch. Good opportunities for education. In the area where I worked, office politics was almost non-existent and managers were straight-forward. There were no surprises in the semi-annual performance reviews, however, getting a GREAT review is nearly impossible according to the rubric they use (think "able to leap tall buildings in a single bound"); so an average performance review at Nationwide is fantastic anywhere else. Lots of opportunities to advance and move around the company. When they laid off anyone in our area (which is to say, I don't know if this is company-wide behavior), they told us that we would be receiving our 60-day notice about 30 days in advance. Once we got our 60-day notice, our job was to find a new job. Still had all of the benefits during that time. Severance pay was one week per year of service. Decent pension, if you work there long enough.
Cons
Nationwide's I.T. strategy is to move software development off-shore as much as is possible. For those positions which cannot be moved to off-shore, they bring Indians over here to be the interface for the devs back home. Nationwide's partner in crime is Infosys. As we trained our incompetent replacements, we saw all of our hard work flushed down the toilet when they decided to hard-code *everything* instead of using our table-driven "code". Our manager was disgusted, her manager (and, probably, upstream managers) saw only dollar signs. In the end, this move will end up costing the company more in the long run, with far, FAR worse quality and unmaintainable code. Que sera, sera.