Well, if you want to run the 7x57 at pressures in the 50-52 KPSI range you will indeed get the advertised anemic performance.
Propellant gas can't read headstamps. All the gas "knows" is how much brass and steel there is between it and outside air. So it doesn't "know" whether it's in a 270 case and chamber or a 7x57 case and chamber, since the relevant dimensions are the same. You can shoot a 7x57 at 62 KPSI as safely as you can a 270.
Still, I run my 7x57 loads at more modest 30-06 pressures and below and get the MVs I have listed.
That 150 grain load I mentioned earlier runs 2865 FPS at a measured 56.6 KPSI, which is quite conservative. I haven't done testing on 140 grain loads, but those ought to be nipping at the heels of 3,000 FPS at that same modest pressure.
In a strong action, at modern pressures, it is an exceptionally nice round. If you class it as a medium range round, then you have to say the same for the 30-06 and 270, and I don't think you'll get a lot of agreement on that claim.