True enough, the china spokes vary in quality a lot, and you can get some that are just so bad they are nearly hopeless.
But in my expereinces, which mostly have been with suspension bikes, if you get the spokes tensioned right, they may still make some noise but not as much as before, yet not be overtightened to the point where they have to start breaking, or pulling out of the rim.
But it depends on many things, if you are heavy, and the streets are that bad, and you have no suspension, and you hit those potholes fast, you might really need nothing less than the best spokes.
I still think though, that once you get the hang of wheel tuning, you can find that happy place where the wheel is not too noisy, yet not overtightened either. The idea is to let the spokes flex some when they really need to, in the pothole. But they shouldn't be flexing a lot on every straight running revolution of the wheel like they do when too loose.