Have you tried/used the iPad Air? How can you pass a judgment on something based on reviews when the reviewer himself is asserting something opposite to you?
"How can you pass judgement on anything you haven't experienced yourself?"
People do this all the time. Have you no opinions on rape, child abuse, or murder? I realize judging a physical device is different than moral, ethical and legal issues - but people will have varying levels of experience on almost everything in this world - and the person with the most experience isn't always the most-qualified to pass judgement.
That's my (apparently missed / poorly made) point, in broadening what they did to literally everything in life. People pass judgement by collecting info from multiple sources, from related things they've done, etc. So calling someone out for doing so without having experienced something is pretty naive / willfully ignorant of how they live their life.
Absolutely, argue, you might inform them of something new and swing their decision. But dismissing their opinion entirely is wrong in many ways.
Do you able to venture an opinion on whether it would be enjoyable or not to have your testicles slammed in the door of a car?
You can question the validity of the opinion but we all extrapolate on what we do know and fill the gaps in with views and information borrowed from others and reasonable assumptions.