It would be really helpful if the overview tab or alternative tab could be customized for each dataset. Ideally everything has a default view but many datasets such as tables and specific spatial datasets could really benefit by charts or embedded web maps residing on the landing page of the dataset.
Open data serves many different user communities and for the executive or average citizen user populations they do not want or care about much on the overview or data page. They want to see a visualization immediately so they can gain information about the dataset and how it relates to them.
I see a number of agencies using ESRI Open Data for spatial and other solutions for tabular. Maybe supporting custom visualizations natively in the overview or another "tab" as the default view could solve this problem for many.