The bar for what's "quality content" keeps on rising. Here is what's working right now...
Visual: images & video in content
People are more engaged when there are pictures and videos in content. Since most people skim content, the visual elements are a must to get your message accross.
Make sure your content is mobile friendly. I would say that at least half of consumable content gets read on mobile devices (Flipboard, Prismatic, etc). So making sure your content displays properly on those channels is super important.
Helpful, unique, and emotionally engaging
Those are the key ingridients to keep in mind when creating content. If you're going to put out bland content, you're going to get a bland response.