If you like playing without a superhero power, just use Flash (rimshot)
Sometimes I play without superheroes. I always pick one to play with, but then I forget that I have it or what it does.
There does seem to be a general agreement that Flash's is the weakest power.
I wonder if he'd be okay if his power were simply that you draw a 6-card hand instead of 5? Or would that be too good?