One of the most annoying parts of downloading data from large portals is that you never quite know what you're gonna get. It's a box of chocolates. It's government data sites. It's lists of datasets with vague or unhelpful titles with links to download. Of course, I'd rather have a hodgepodge than nothing at all, but as with most things, there's room for improvement.
The OECD, which maintains and provides data on the country level, takes steps towards a more helpful portal that makes data grabs less of a headache. With the help of Raureif, 9elements, and Moritz Stefaner, the new portal is still in beta, but there's plenty to like.