As several of the above posts have mentioned, it is important to discern several things about a review:
1. Is it reputable or clickbait? YouTube in particular is notorious for hundreds/thousands of reviews which are mostly (not all) clickbait and not worth looking at. Most of us know which sites are reputable and which aren’t (don’t want to seem as if I’m advertising for these sites lol).
2. Is it biased? Reviews will often have a slight bias (usually with wording and final ratings) in favour of one company or another, but this is inevitable. The reviews to avoid are the hypocritical, unapologetically/completely biased ones (great example is BGR and Forbes...the former criticised the 2 XL in every way possible even if it didn’t make sense, for example its round corners).
It’s important to note that just because you disagree with a review (usually when it comes to battery life or how ‘good’ the software is which are both dependent on the user).
3. Is it fair or realistic? The YouTube video posted on this thread isn’t what I would call realistic unless you regularly sit on your phone (inside your back pocket). Most modern phones are built to an acceptable level of durability. The usual sources of damage to phones are scratches/cracks due to them being dropped or water damage (hint: don’t get your phone wet if there is no IP rating)...’tests’ showing phones being dropped from tens of metres high, intentionally snapped/crushed or set on fire aren’t realistic.
As for ‘fair’ tests, reviewers should be more or less consistent in how devices’ performance, cameras and battery lives are reviewed across all reviews.
Hope that helps