Common Mistakes Reviewers Make — and How to Avoid Them

Even experienced reviewers fall into patterns that undermine the quality of their reports. Here are the pitfalls to watch for.

The peer review system depends on the voluntary service of thousands of researchers who dedicate their time and expertise to evaluating the work of their peers. Most reviewers take this responsibility seriously. Yet certain recurring mistakes — often made unconsciously or with good intentions — can compromise the usefulness of a review and, in some cases, cause real harm to the editorial process.

Understanding these common pitfalls is the first step toward avoiding them. Whether you are a first-time reviewer or a seasoned evaluator, the patterns described below are worth reflecting on before submitting your next report.

1. The Superficial Review

A review that consists of a single paragraph offering a vague overall impression — without engaging with the manuscript’s methods, data, or argumentation — provides little value to either the editor or the authors. Editors report that unhelpfully brief reviews are among the most common problems they encounter. A substantive review typically runs two to three pages. If your report is significantly shorter, consider whether you have addressed the manuscript’s core claims with sufficient depth.

1. The Rushed Review — or the Delayed One

Both extremes are problematic. A review completed within minutes of receiving the manuscript is almost certainly superficial. On the other hand, a review delayed by weeks or months can stall the entire editorial process, frustrating authors and editors alike. If you cannot meet the deadline, notify the journal promptly. Timeliness is a fundamental component of responsible reviewing.

1. Reviewing Despite a Conflict of Interest

Conflicts of interest are not limited to direct financial relationships. They include reviewing manuscripts from close collaborators, former students, institutional colleagues, or competitors working on closely related projects. Even if you believe you can be objective, the appearance of a conflict can undermine confidence in the process. When in doubt, disclose the relationship to the editor and let them decide.

1. Imposing Your Own Research Agenda

One of the most subtle and damaging reviewer mistakes is evaluating a manuscript not on its own terms, but against what you would have done differently. This manifests in several ways: recommending that the authors cite your own publications, insisting on a different methodology when the authors’ chosen approach is sound, or expecting the manuscript to address questions that fall outside its stated scope.

Evaluate the work the authors actually did — not the study you wish they had conducted. If their methodology is valid and their conclusions are supported by the data, the manuscript should be judged on that basis.

1. Focusing on Minor Issues While Ignoring Major Ones

New reviewers are particularly prone to this mistake. It is easier to flag typographical errors, request additional references, or suggest changes to figure formatting than it is to critically evaluate the underlying science. Yet a review that catalogs minor issues while overlooking a fundamental flaw in the experimental design fails in its primary purpose. Always address the big questions first: Is the research question important? Is the methodology sound? Do the conclusions follow from the data?

1. Using Hostile or Dismissive Language

The anonymity of peer review can, unfortunately, lower the threshold for incivility. Comments like “the authors clearly do not understand…” or “this work should never have been submitted” are unprofessional and serve no constructive purpose. Critical feedback can and should be delivered with respect. A measured tone does not diminish the force of a substantive critique — it strengthens it, because the authors are more likely to engage with feedback that treats them as colleagues rather than adversaries.

1. Recommending Rejection Without Explanation

A recommendation to reject must be supported by clearly articulated reasons. Editors cannot act on a bare recommendation without understanding the rationale behind it. If you believe the manuscript is fundamentally unsuitable — whether for reasons of scope, methodology, or originality — explain why in your report. This allows the editor to make an informed decision and gives the authors constructive feedback they can use for future submissions.

1. Inconsistency Between Comments and Recommendation

If your written comments are largely positive, noting only minor issues, but your recommendation is to reject, the editor faces a contradiction. Similarly, a report that catalogs serious methodological flaws but recommends minor revision sends a confusing signal. Ensure that your recommendation is proportionate to the concerns you have raised.

1. Failing to Declare Limitations in Expertise

In a multidisciplinary journal, it is common to receive manuscripts that partially fall outside your area of specialization. This is not a problem — provided you are transparent about it. If you can evaluate the statistical methodology but not the domain-specific literature, or if you are qualified to assess the clinical implications but not the computational methods, say so. The editor can then ensure that complementary expertise is sought from additional reviewers.

1. Treating Peer Review as a Gate Rather Than a Bridge

The most effective reviewers understand that peer review is fundamentally a collaborative process aimed at improving the quality of published research. It is not a gatekeeping exercise designed to reject as many manuscripts as possible, nor is it a mechanism for establishing intellectual dominance. The best reviews are those that help authors see their work more clearly and provide a realistic path toward publication — whether in this journal or elsewhere.

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This article draws on reviewer guidance published by the Committee on Publication Ethics (COPE), and the American Geophysical Union (AGU). Research and Science Today encourages all reviewers to consult the COPE Ethical Guidelines for Peer Reviewers as a foundational reference.