Pros
Good people work here (and they deserve better than Nielsen). If you take a job here, negotiate the biggest possible salary, the biggest possible annual bonus then accept you'll only be around for a few years before they lay you off.
Cons
At Nielsen, you aren't a person. You're just a number - your salary+bonus. The GE/Jack Welch management idea of "constantly fire X% of the employees to reduce salary costs. Meaning, they don't fire the poor performers as much as they fire longer term employees (who aren't management's favorites) because they're making too much money. So there's not a huge incentive in a place that doesn't reward high performers - when the raises start, the clock starts ticking. There is NO ONBOARDING with the company so hope someone's willing to explain this bizarre corporate model. Everyone spends all day in Google Hangouts and not actually talking to each other. Nielsen's business model is dying because it can't make sense of 21st century technology. They're losing relevance and they know it. All the best seniors are getting out, we've lost some great leadership in the last few years. CISO is CIO's workplace son and promoted past his ability to manage, lead, etc. Not his fault but prime example of corporate favoritism leads to progress for the few (and the young and inexperienced.) Great employees leave before getting laid off which is a huge waste of talent.