Pros
Good compensation and smart people are the reason people come to Capital One and the reason people stay at Capital One. The company recruits from top schools throughout the country (and the world), and invests heavily in professional development. In general, the company does a lot of the right things for employees -- allows working from home, good benefits (which don't increase in cost by 10%+ every year), fair severance (historically), etc.
Kontras
Job security is virtually non-existent. Growth is gone, which makes it difficult to advance as senior managers protect their kingdoms instead of take on risks. Performance reviews and bonuses are driven more by tenure and politics than the company's managers would like to admit, and HR has a long track record of blunders when trying to address these problems.