What I have learned about data viz over the years is that it is a very powerful solution to problems, just as Nightingale's diagrams demonstrated the effect of hygiene, which changed how societies and governments respond to epidemics. What I have also learned is that a solution obviates a dynamic someone thinks it is their job to manage, and a visualization that solves a problem is its own problem. The "best," diagra…
Do you have any examples of these "worst" diagrams?
WebOWL Ontology tools, most Sankey diagrams, digraphs, radial dendrograms in d3, and pretty much anything that can represent more than a couple of degrees of freedom.