No doubt Kodak, Ilford and Fuji were and are far more consistent. But Efke was usable most of the time. Considering they were apparently working with "stone knives and bearskins" to quote Mr. Spock, they did pretty darned well.

(City on the Edge of Forever: "I am endeavoring, ma'am, to construct a mnemonic memory circuit using stone knives and bearskins.")