I put "pass" in inverted commas because the mark of 70 is the minimum expected mark at Level 4 or 3 in England, for example.
In games where the referee is not overly tested, good observers look for the referee's part in it being an easier game to referee, movement and proximity, communication, management of situations (e. g. early corner kicks at each end) and the other elements which combine to create a good performance.
It is easier to increase one's mark in a more competitive game, but equally it is easy to decrease the mark.
edited for accuracy