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I think the main thing is that arena PvP is generally punishing to melee. Melee are heavily penalized by server lag, numerous snares, etc. Warriors are the exception to the rule (somewhat) because of intercept, which is a really powerful ability, and especially so for arena. During the initial moments of a match, a rogue is equivalent to a warrior in terms of being able to keep on a target (due to sprint/vanish), but as mentioned, that effectiveness completely disappears for a rogue, whereas a warrior can do it every 15 seconds.
The combo point mechanic is also far inferior to rage or mana mechanics in the arena, since target switching is a vital part of doing arenas. When I'm playing my warrior, I can do driveby hamstrings, or swap targets when I get frost nova'd and someone new walks in range. Rogues are severely punished for changing targets.
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