Good reviews need constructive criticism !
If a part of the game as issue, talk about it and explain why it's an issue. If a part is good explain why you like it.
As a game developer, a good review explains what I did good (and why) and what I need to improve (and why).
As a player, a good review explains the good and bad parts of a game (and why; just like the review for developer) and also avoid spoilers.
When I receive written review I copy-past the review in LibreOffice Writer and turn green the section about good parts, red for the bad, orange for the minor inconveniences and blue when the player didn't like my design choices. A video review should give enough details to color code the time stamp in a similar manner.