I agree that data can easily be manipulated. That is why I provide the source of the data, when the data was accessed, and how the data was analyzed. I also give limitations of the dataset. I agree that the more information one has the better the analysis. Blizzard’s analysis reached the conclusion that barbs were roughly equivalent to WD and wizards. I can not check their methodology.
You can check my work since I use accessible information and explained precisely what I did.
The analysis is imperfect as is the dataset. I even say so. It provides a picture on the data available that can be obtained in a feasible amount of time.