Write for your future self first
Start with what you are likely to forget. Was the ending stronger than the setup? Did the second half drag? Was the game better with four players than two?
That small detail is often more useful than a plot summary. Your future self can look up the premise. You cannot look up your own reaction.
Name the audience
A review gets sharper when you can say who should try it. Maybe it is for patient readers, strategy-heavy groups, people who love messy character drama, or friends who want a short co-op game.
Recommendations become easier when every note includes a hint about fit.
Keep criticism specific
Specific criticism ages better than broad dismissal. Instead of writing that something was bad, write what failed: pacing, tone, controls, length, difficulty, prose, table downtime, or payoff.
The goal is not to sound definitive. The goal is to make the logged memory useful.