Our aussie cert. are good and i think we get a bit spoilt with them.
I have ordered English certs. before and were of no use but then a couple of them did give addresses or father's name which helped to find some stuff.
But then again i have had aussies ones that have been useless. One aussie marriage cert. i did get was laughable. 1885 it was and had near nothing on it. No parents names, no place of birth, no age, no address of where married, besides it saying the "residence of Mr unreadable" Most well say besides their names and the name of the person who married them and date of marriage and town there wasnt much else on it.