Cons of peer review is, it can show the bias of reviewers.
Some issues with peer review :
The peer review process, in theory, can lead to a distortion of the results from the perspective of the evidence user, akin to bias. Peer review bias is defined as a lack of objectivity in the evaluation of a submission. Reviewers may view peer review as an exercise in "fixing" or "correcting" surface-level errors, and as a result, they may overlook more serious issues in content, support, organization, or audience awareness.
There are no grading systems for peer review quality. There is no way to know the expertise and quality of the reviewers or editor because different journals have different standards.
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