Caster of the Sisters of Elune server is known for posting weekly statistics for the three arena brackets, data which helps demonstrate gross inbalances among the various classes in small (2v2), medium (3v3), and large (5v5) PvP settings. Because this data is generally posted via the General forums, it’s easy to lose among the clutter. Luckily, someone has created line graphs of class populations over each week of Season 1:
According to the data above, druids consistently underperform almost all other classes. In fact, only hunters fare worse than we do and only in the 3v3 and 5v5 brackets. With today’s change to Cyclone so that it can be dispelled by the PvP trinket, things are likely to get worse.