Posting average content just because you have to post content on your website will not be going to favor you. It can backfire you for sure as your audience might build a negative perception of your website. To make sure everything works out well and in your favor, of course, you should always post great content no matter what. Your website is a representation of your company or business, so, you should always keep in mind that posting downgrade content will decrease your viewership. As a matter of fact, you should aim higher & post content which engages more & more consumers.
Traffic data is a great way to take the temperature of your website and marketing initiatives. When you are writing and promoting blog content on a regular basis, you can use traffic data to track results and correlate these efforts to actual ROI. Be sure to look at traffic numbers over long-term intervals to see trends and report on improvement over time.
To do this, I often align the launch of my content with a couple of guest posts on relevant websites to drive a load of relevant traffic to it, as well as some relevant links. This has a knock-on effect toward the organic amplification of the content and means that you at least have something to show for the content (in terms of ROI) if it doesn't do as well as you expect organically.