Some review comments are especially useful because they describe problems that can be physically tested.
Performance Signals
Phrases such as “stopped working,” “leaks,” or “broke after use” can suggest performance or durability questions.
Usability Signals
Comments such as “hard to clean,” “difficult to assemble,” or “confusing instructions” point to user-experience friction.
Expectation Signals
“Smaller than expected” or “not as described” may indicate a gap between product presentation and actual experience.
A review signal is not proof of a product problem. It is a reason to investigate.