With lots of transfers happening across borders these days, it's hard to know exactly how the leagues compare. Numbers can help with that sort of thing, but of course, they have their limits. We know that some leagues are better than others, and we know that leagues differ in other ways like parity as well.

Continuing on the theme of "a picture's worth a thousand words", here are the best and worst performing offensive sides from across the Top 5 European leagues (Premier League, La Liga, Bundesliga, Serie A, and Ligue 1) over the last decade (since the 2001/02 season).
The bars show the average number of goals scored per match; the axes on the two graphs have identical scales so that you can see how much better the very best teams were than the very worst.