That’s a very personal opinion, but I don’t think there’s a need for more than 5 points to rate an article, or a movie/game etc.
When we see rating like 67%… I always wonder, why 67? Why not 65 or 70?
A 5 stars notation is more straightforward, even if the results are always biased (almost never 2, always a bunch of 1 and 4-5).
Anyway, if you’re looking for topic ratings, there’s this plugin: