It is quite a complex procedure to rank mba programs at any time. However, you not only want the 'mediocre' mba's listed but you also want them ranked!

I assume that by 'mediocre' you actually mean 'cheaper' or 'not expensive' ?

All the unis you listed are good standard. I do not think Griffith runs a proram in Sydney or Melbourne. Also, Wollongong is a city outside Sydney, but it can be a better place to live because it is cheaper, less crowded, and on the beach, but it might not be so easy to get a part-time casual job.

Australian employers will usually select people who are best for the job. There is no standard practice of just selecting someone because of the school they went to (as happens in many Asian countries). Therefore, if you have the skills that the employer is looking for you will get the job.