Not surprised... as a "temp power attack" it would disregard the normal AT damage modifiers. Kheldians are normally Defender base damage so by comparison to their other attacks it'd seem a lot higher. 
Temps don't affect containment, gauntlet or crits (though they'd get a cosmic balance/defiance boost).
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The attraction for me as a mainly human-form PB was the near-blaster level single-target blapping damage output, along with respectable AOE damage output.
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I just noticed that my Vet sands of Mu does more damage than my radiant strike 5-slotted with SOs o.0