Yes, that's right. I wish all my control valves controlled in the 25-75% range! That is the best interval. The sweet spot, of course, is 50%!
A lot of times I have found control valves that control in the lower range, say almost closed to 10%. That is because there seems to be a tendency to be conservative and control valves are over sized. One should strive to purchase a control valve that has at least one or two sizes of trim bigger and smaller than the selected trim size. That way you have a chance to dial your control valve into the 25-75% range once you see it perform.