The bigger the bank, the higher the rate of consumer complaints. That is the general pattern of a new Sunlight Foundation analysis of just-released consumer complaint data from the Consumer Financial Protection Bureau (CFPB). The relationship is hardly surprising. The biggest banks consistently score the worst on surveys of customer satisfaction. The most recent survey found Bank of America with the lowest customer satisfaction rate. We find Bank of America to have the second highest rate of complaints, trailing only Capital One, a major issuer of credit cards. Capital One accounts for 21.3% (4,181 of 19,603) of credit card complaints in the CFPB data.