Why do we trust so much reviews when making an online purchase? For the same reason we trust a true opinion when buying a product offline.
Baymard Institute did an amazing research and found out that 95% of users relied on reviews to learn more about products.
It’s not just up to businesses to tell their users/customers how great their product is, it’s up to other humans as well. As a matter of fact, a simple online review might be more powerful than a huge amount of copy trying to convince you that a product is good.