Here's some of the most basic flaws in speedsters powers in comics:
If you look at the science behind speed, if you're going faster than Mach 1, you will create a shockwave. At ground level in the average downtown district there's tons of buildings, cars with windshields, landscaping (plants, fencing, etc)... heck even the street itself which would be destroyed if the speedster ran at the types of speeds they're purported to run at, because they're not designed to withstand the level of force. And this is at relatively low speeds.
Seeing that they don't shatter everything as they run past it, they have to hold the power of the shockwave back, how do they do so? If you look at the principle of the conservation of energy, which states that energy can neither be created or destroyed, what do they do with that potential energy?
Also, some of these speedsters can run as fast as, if not faster than the speed of light. If you look at the science behind this, the faster an object goes, the more mass it picks up, so as they approach the speed of light, they would get heavier and heavier to the point that they should get to the point where they can't move, yet are able to shatter it routinely. So do they get stronger and stronger as they approach light speed?
Even speedster who are "new" at this type of a thing never have this problem.
For Sake of discussion, think about the Flash (DC) and Quicksilver (marvel)
Shouldn't these flaws break the readers suspension of disbelief? Or am i missing something here?