KEY FINDINGS
- People who wrote just one review (146,346): average 4.196 stars.
- People who reviewed two or more places (23,984 = 14.1%): average 4.040.
- People who reviewed five or more (2,918): average 3.990. Perfectly monotonic across a 0.2-star spread.
Introduction
Are all reviews created equal? We looked at that question from a simple angle: does the person who wrote a single review in their life rate differently from the person who has tried dozens of places and written about them? We examined 281,857 written reviews spread across 170,430 reviewer names, and sorted every reviewer by how many times, and how many different places, they had reviewed. The idea is that the reviewer's own behavior may carry information as valuable as the rating itself.
The result was clear and consistent: the more active the reviewer, the lower their average star rating. The gap is not enormous — about 0.2 of a star — but it is perfectly monotonic, meaning it moves in one direction with no zig-zag, and that is what makes it interesting. When a number moves one way across three independent groups, it is hard to write off as chance.
The numbers
| Reviewer type | Count | Average rating |
|---|---|---|
| Wrote one review only | 146,346 | 4.196 |
| Reviewed two or more places | 23,984 (14.1%) | 4.040 |
| Reviewed five or more places | 2,918 | 3.990 |
Notice the gradient: 4.196, then 4.040, then 3.990. Each step up in activity nudges the average down. The one-time reviewer is the most generous; the prolific reviewer (five or more places) is the harshest. The gap between a one-time reviewer and a two-place reviewer is about 0.156 of a star, then it widens further with volume — and that steady gradient is what gives the finding its weight.
What does it mean that only 14.1% review more than one place?
There is another number worth pausing on: 85.9% of the reviewers in our data wrote about only one place. The active minority (14.1% who reviewed two or more, and just 2,918 who reviewed five or more) carries a disproportionate share of the market's collective memory. They are few, but they are the few who have tried many, so their opinions are far more comparable across places. When you read a review from a prolific reviewer, you are reading a relative judgment built on wide experience, not a standalone impression.
The professional-critic effect
The most likely explanation is frame of reference. Someone who visited one place and liked it gives five stars easily, because they have nothing to compare against. Someone who has tried twenty restaurants has seen the best and the worst, so they grade on a curve: five stars, to them, means "genuinely exceptional," not merely "good." The prolific reviewer is an informal professional critic, and their bar is higher. It is like a teacher who has graded a thousand papers versus one grading their first: the first is harsher, not because they are less fair, but because they have seen the full range of quality and know where each place falls within it.
What it means for the everyday diner
If you are searching for a place, this finding helps you too. Four stars from a reviewer who has written about fifty places is worth more than five stars from a first-timer, because the four survived a wide comparison. When you browse reviews, look for the long-track-record accounts and read what they said; they are the closest thing to a neutral critic. And do not be swept up by a wave of five stars from brand-new accounts with no history — they may be sincere, but they are the least experienced at comparing.
Why this matters for a fair rating system
This finding supports a core principle of our methodology: reviews should not all be treated with one blind weight. A system that weighs smarter — accounting for data volume and reviewer context — is fairer than a plain arithmetic mean. We use a Bayesian adjustment that balances the number of reviews against their values, and the details are on our methodology page. The goal is not to ignore the one-time reviewer, but to read every voice in its proper context.
How to read a low rating
This matters for business owners: a low rating from a prolific reviewer is less alarming than the same rating from a first-timer. The former is grading you against a hundred prior experiences; the latter may be reacting to a single off moment. When you read your reviews, look at the reviewer's track record, not just the number: how many places have they reviewed? Do they give everyone two stars, or are you the exception? Three stars from a prolific critic may in fact be praise in disguise.
An honest caveat
Reviewer names can collide; two different people with a common name may be merged into one record in our data. But note the direction of that error: merging mixes reviewers together, which pulls the averages toward each other and shrinks the gap, not widens it. In other words, the true difference between one-time and prolific reviewers is probably larger than what we measured, not smaller. That strengthens the finding rather than weakening it. Honesty means naming the limits of the data even when they cut in favor of the conclusion.
How we measured
We grouped reviews by reviewer name across our entire database (281,857 written reviews), and for each reviewer computed their review count, the number of distinct places they reviewed, and their average stars. Then we compared the three groups. We excluded no category or city — this is a look at the reviewers themselves, not the places.
Related reading
If you enjoyed this, read about the gap between Arabic and English reviewers and why reviews cluster at 5 or 1. On Raddod we factor in each reviewer's track record when analyzing your reviews — start free at raddod.com.