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Its the min-maxers who calculated the loss in DPS due to knockback that almost cost Super Strength its defining cool feature: Knockback.
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I'm far from a "min-maxer", I'm just a casual player (level 32 SS/Invuln tank on Pinnacle). While KB does indeed seem cool and looks great when you first get Haymaker, after a while it's nothing but a PITA not only for me to have to chase down the target, but also the other melees that are in my group. Also, it has the disavantage of knocking targets out of AE range.
Like Amway, KB looks good in theory and on paper. Once it's in practice though, you see it's flaws.