Over half of the respondents were not in the USA, implying that Tableau is a truly global product, with a growing global community. It's important to note here that most countries have recognized (FIPS, ISO, NUTS) boundaries and administration levels that simply aren't currently catered for. To address this, I've been able to prove out that importing OSM/GADM data into Tableau is not only possible, but it is also extremely effective and with open source tools, efficient.
*Example of poor fidelity "out-of-the-box" background mapping:
Ireland, Census 2011 Shapefile, EPSG 4326 20 meter resolution (dark grey outline) with default online background map (light grey outline)
*Example of poor fidelity "out-of-the-box" foreground layer mapping:Maine, USA, default fill (filled map mark type), EPSG 4326 with GADM Admin Level 1 Shapefile rendered using PostGIS table Shapefile in WMS