I suggest the star rating of topics should be change.
One vote- one star system.
Whats the use of 5 star when someone click one star the rating will change to 3 star ?
Very easy to sabotage.

We used to have it requiring a minimum of five votes before a rating would appear, however so few people rated topics that no ratings ever appeared on any of them.

The current one-vote system is an experiment to see how that performs.

There isn't a whole lot of rated topics even with the one star
system.