We present our experience of adapting a rubric for peer feedback in our data visualization course and exploring the utilization of that rubric by students across two semesters. We first discuss the results of an automatable quantitative analysis of the rubric responses, and then compare those results to a qualitative analysis of summative survey responses from students regarding the rubric and peer-feedback process. We conclude with lessons learned about the visualization rubric we used, as well as what we learned more broadly about using quantitative analysis to explore this type of data. These lessons may be useful for other educators wanting to utilize the same data visualization rubric, or wanting to explore the utilization of rubrics already deployed for peer feedback.