Well to be honest, what were they expecting with an episode that started at 9pm and ran to 11pm. If it's meant to be a family show, half of the audience that they are going after would be in bed halfway through if not earlier...
And then they decide to put random shows like Highway Patrol/RBT/Border Security whatever those joke shows are on in the glorious Wednesday and Thursday 7:30 and 8 timeslots... like does anyone literally watch shows like that intentionally...
And top that off, there really isn't any major competition in those timeslots on other channels at the moment, so if it was on at say Wednesday at 7:30, the ratings might be double if not triple what we got...
Anyway, it's nothing new, really. Anything ever worth watching on Seven never starts before 8:30 - all I basically watch off it are Revenge and Criminal Minds and both get 8:30 or 9 starts - so I don't know what they're playing at, but they're killing their own show.