4.2 Structured data, specific typesMediumVerified
Product missing/invalid review/rating
What it is
Review markup absent or wrong.
Why it matters
Misses or invalidates rating stars.
How to fix it
Add valid review/aggregateRating per policy.
Impact
Low-medium. Direct.
Evidence
Follow review snippet rules. Google Search Central, Product (structured data); Google Search Central, Structured data general guidelines
Sources