How to write good reviews

Do Your Research
Check multiple sources and don't limit yourself only to the most popular article/comment. Also be
careful with sponsored or paid content, as it's not reliable source of opinion, because in most cases
it's meant to be positive.
Apart from a good researching and googling skills, a broad knowledge in the covered field is
essential, as one needs to write from a position of an expert or at least an experienced customer. It's
good to have some point of comparison to better talk about topic and know which features are
considered an advantage and which should simply be an industry's standard. Potential reader trust
you in your assessment and judgement, therefore a proper knowledge about the particular market is
always desirable and in some cases actually needed. That way you can better compare for example
different services, as you know what to compare and put focus on.