Originally Posted by
Forsta
It's not ideal to compare on a spec per spec basis, as classes with multiple dps specs always lead to seriously skewed logs. E.g. If Fire is 5% better than Frost and Arcane on a boss, most mages killing the boss - especially those in good guilds - switch to fire. This leaves Frost and Arcane as much weaker in those lists than they actually are. It's not ideal, and Blizzard should work more to keep the specs closer together. It also makes it really hard to tell which of those specs would really need some buffs, and which are just not played by good players because they're a little weaker than the counterpart. But it has to be kept in mind when looking at statistics.
Thus, the better comparison is taking the top spec from each class, with the exception of melee / ranged differences, and use those for the calculations. Taking that, WW is between upper middle of the pack and middle of the pack on most bosses. That is a really good place to be - as middle of the pack should be the balancing goal for all classes. But obviously with so little data the statistics still suck, so it's a little early to draw conclusions.