Yep.. dont think they are very selective... my scenario:
I did 1yr at UWS - B Commerce... did total of 7 units in the first yr... 4 in first sem (3 pass 1 distinction) and then 3 in second semester (2 credits and 1 pass)... applied for maquarie transfer and got in!... my gpa at UWS was 4.6.. wasnt expecting to get in with that kind of GPA but very happy!
However, all the pass grades i achieved (4 of them)... all my marks were between 60-64.. so i missed out on 4 credits pretty much... may be thats why they allowed me to transfer.
anyways, goodluck!