The thing is…to be “accurate” enough, a tester/reviewer needs to perform all the tests under the same conditions every time and have the data from those experiences (current measurements, parasitic drain, tint, beam pattern, voltage drops, whatever … and all the measurable stuff) meticulously noted down.
That may be quite hard due to the lack of equipment and the lack of time. Specially for those that see this as a hobby!
One thing would be to - as wle says - “digest reviews” and withdraw the data that reviewers/testers post. That would be descriptive depending on the data reviewers provide. Still, many of those things we see/do in our experiences, are not “accurate” enough, namely due to lack of standardized procedure and control.
Examples:
- UIs: I normally like to provide all the information about the UI in a flashlight as it may lead or not a person to chose it. However, some reviews of the same light may lack some information. To grasp it all, it would be necessary to go through several reviews of the same light to collect all the available data about that.
- Tint: a person with a good cellphone cannot compete, probably, with another with a professional camera with N number of settings that capture the real beam colour, dimension and pattern.
Some data may be collected and systematized but there will always be things that will be difficult to grasp accurately.
From the 6 points you mentioned, I guess the easiest to collect is definitely the UI, as it is “standard” for a given model. Still, making an assessment of it… I’m not sure if it would be Neutral and clear enough. I don’t care it it is simple or complex, I wanna know how it works and if if fits my needs. As with all the things in a flashlight!