How is the Flash, with his Super Speed, any more difficult to imagine then Superman, who has so many other powers on top of Super Speed? Or Thor who's a God?
Thor's some kind of alien who doesn't move at super-speed. Superman is a similar case, yes, but since his strength is more of a defining attribute than his speed, it never really bothered me on Smallville
when Clark would simply brawl with his opponents rather than zipping around them and whaling on, say, the back of their necks. His zooming around was a bonus, not his selling point. Hard to see "The Flash" having the same excuse...