It's become apparent to me that there is a group of reviewers who all display the same phenotype when it comes to their reviews. They all i) are quick to agree to review manuscripts in our common sub-sub-field, ii) submit their reviews on time, and iii) will recommend acceptance or minor revisions for all manuscripts. All.
On time? Suspicious that.
Did I mention that this bloc of reviewers are all strongly linked to one particular well-known member of our sub-sub-field? Former trainees, co-authors etc.