Ranking only makes sense in a venue where the number of papers or presentations is limited. There many online journals of good reputation that will publish anything over a certain (obviously not perfectly well-defined) bar. The number of papers tends to increase over the years as the numbers of researchers also increase, and this is considered acceptable. Other journals are so selective that they won’t publish anything if nothing is deemed worthy.

You’re also misunderstanding the point of reviews. They also serve as comments to the authors to modify their manuscript and make it acceptable for publication.