The phrase "varying quality" means that something is not consistent; it can be different or of different levels of goodness or excellence. Full definition
This paper examines the attrition and mobility of early - career teachers of varying quality using value - added measures of teacher performance. (caldercenter.org)
He's a chaotic mixed bag of wildly varying quality. (snackbar-games.com)
We are dealing not only with various operating systems or screen resolutions, but also with varied quality and capabilities of the devices. (elearningindustry.com)