Dr. Brent Coker shares research from Facebook that demonstrates the POWER of negative reviews. In a nutshell, they compared a company with ONLY positive reviews vs. a company that also had negative reviews and responses to them.
The results demonstrated an increase trust in the brand:
Read the entire article and see more charts and graphs on their website.
Negative comments do help us learn from the mistakes and grow further. If a particular brand has only positive feedback it raises a question on the integrity. Any brand would ideally have mix of reactions from the users.