Pros
Capital One offers great benefits, including non traditional benefits outside of dental/medical categories. They have a gym with personal trainers (for a small fee), a doctor's office for you and your family, a post office, and a bank all on site (at least at two of the corporate locations that I have visited). Capital One is open to flexible work arrangements. Some groups are more flexible than others, but there is a general push towards ensuring that everyone feels that they have a good level of flexibility in the workplace. I have been lucky enough to benefit from this, as I am allowed to work from home some days ( i do it at least once a week!). This is one of the reasons that Capital One has been consistently ranked as a top workplace for working mothers. In general I feel that Capital One hires great people. Most people that I have encountered are intelligent, driven, collaborative people. Most of them are friendly as well, which makes coming to work a lot easier!
Cons
I have noticed that there is a tendency in the culture to want to meet about everything. This is good from a collaborative point of view, but it seems to me that some meetings are scheduled "just to be had." This eats up time to actually do the work- there is a lot of talking but not a lot of actual process! Some groups have a tendency to over-complicate. Some groups seem to expect a high level of multitasking ability, which is proven to be an inefficient way to work.