It's Melbourne IT. A terrible company that somehow still gets large contracts despite ripping clients off at every step. I'm sure their entire staff is underpaid 457s.
I used to be an underpaid 457 for nearly a decade until I got PR. Just because someone is an immigrant on a work visa doesn't mean they're incompetent. And organisational culture is a top down process, not a bottom up one. So blaming the workers seems misplaced when it is most likely a management issue (who probably aren't 457 holders). That would probably be more accurate.