Most of these arguments focus on two topics;
- will the product do what is claimed, and
- is it worth the cost
The performance of the product can be respectively discussed/debated on these forums based on both objective specifications and measurements, and subjective observations of those who have tried the product. The worth or value of the product is judged uniquely by each individual, based on criteria that likely varies from person to person.
The trouble starts when people attempt to refute the subjective assessments and/or the value judgements of others. Of course, it only gets worse when those detractors have never heard or used the product themselves.