Part of the win percentage thing I believe is that rages seem very over powered in the lower tiers it wasn't until legends/pit lords that my rages that are that high went below 75-80% win ratio, now that they are in the pit lord/warlord they are dropping rapidly, and most fights that they loose i either see a lot of CD now, or I face another Rage that got the jump on me. I would guess its even worse at higher levels as they will see more and more glads with max or near max CD.

A good example of this from my guys is Legend (58th) Varqus 120 - 21 - 6, sitting at 85% in legends, over half of those losses have been since he entered legends. Now he is a duel wield but this pattern just seems to hold true for rages in general.