My standard is that no more than one in a million votes should be miscounted in any country and that we should do something about it in America. This is not a partisan issue, I bear none of the typical grudges, e.g. about 2000, which I think showed that the system worked even though I disagreed with the Supreme Court of the US. The purpose of clean elections with rational processes for adjudication is to prevent civil war, so the system worked.
There should be a national mission to achieve that sort of nationwide accuracy, no more than one miscounted vote per million.