EDIT: oops
It's kinda the best we've got, but yeah, I generally agree. For movie enjoyment, I'd not bother. For Rumbles, well, feats are a thing.
With bullets, we can look at the gun and estimate the speed of the slug, even though we can't see them in the air in most cases.
Energy blasts are different: we have no idea how fast they are going because they are purely fictional. Plus, people can see them, and many many people are still stuck on the concept that if you can see something it must be slower than a bullet. But bullets are hard to see because they are small, fast, and don't emit light. Energy blasts in fiction typically DO emit light. The example we can always throw back is tracer rounds: paint some white phosphorus on the bullets, and you can track even very high speed bullets (5.56 and 7.62 NATO, 50 cal) with your eyes.
So... either we don't use energy blasts at all for feats, or we try to quantify them somehow, if it's possible.