One motivation for establishing PCAOB inspections is widespread criticism that AICPA peer reviews are ineffective, due to
their lack of independence.
Despite this criticism, however, peer review reports predict audit failures and auditor–client realignment, although the most useful information in the reviews is the evaluation of auditors’ quality control systems and an overall audit firm rating.
This provides evidence that audit market participants value auditor competencies, in this case the effectiveness of their audit quality control systems