You have a point there.

Say, Jazz, how would you like to have another death scene? :P

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Killing normal normal grunts for our group will be a matter of one of the caster/gunner types going "BLLAAAARGGHHH I'M FIRING MAH LAZOR!" and then everyone else standing there with their arms crossed. Even the "grunt" bad guys have to be strong enough to survive the initial salvo.

You are defined by your opponents. Regular/grunt/stormtroopers are fine for the first wave, but then they need some "real" opponents to have a good fight scene with.