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Impale only affects yellow damage. While I've never run recount or WWS to break down my arena damage, I would assume the ratio of white to yellow damage is much higher in pvp than in pve because of the large amount of rage we spend on hamstring, shouts, intercepts, intervenes, disarms, etc. Therefore impale is not only hard to calculate, but probably not doing very much anyway.
edit- It's still definitely worth it in my eyes; I'm not advocating skipping it in the talent tree.
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