For two weeks, Perfect Duluth Day experimented with rating systems for posts (five-star system and thumbs up/down). As you might have already noticed, the ratings have now been removed.
An initial poll showed readers either thought this was a great idea or terrible idea. (The results were pretty evenly split, but slightly leaned in favor of great idea). In practice, however, the ratings didn’t prove useful and interest in them quickly plummeted. In the end, only a handful of people bothered with them.
So now they are gone, perhaps to return another day when a better system can be figured out, or perhaps never to be considered again (except maybe in the comments to this post).