How many more kills against non-damage-reducted characters would you have gotten with deathblow/thirst compared to critical hit?

Nobody's saying that the scout powers are absolute crap and are totally useless. They're saying that the scout powers won't net you as many kills as, say, berserker powers would.

(Having not played any of the three, I don't really have an opinion. Just trying to clarify the point being made.)