Geez, is it hot in here? ...
FD, I don't think Motz is promoting bad airmenship...
In your original post You kept saying "NO REPLY", as if they were supposed to talk back to you? They're not control towers mate, they don't have to read-back your every call, or give you clearance to join... That's YOUR job... Were you expecting every one of the "unknown number" of acft in the circuit to give you the thumbs up that they heard you on the radio?
Perhaps instead of blaming everyone else and running to CASA, try to see what YOU could have done better.
Sounds to me like you wandered into a circuit very situationally unaware ...
Concerned that you weren't being heard/talked back to, yet didn't request a radio check to confirm you were transmitting.
Unaware of how many aircraft were in the circuit and with concerns that they weren't using their radio you STILL proceeded to join
without being sure you had them all sited.
I have to say I'm with Motz on this one - when you look up the very important definition of "OVERFLYING" ... Perhaps read up on when it would be appropriate to use.
Hang about above cct height, get yourself situationally aware, THEN Join if its safe to do so.
Just my $0.02
Planes.