I've got no problems with what they do, its just they focus on things which make bugger all difference, and ignore the real potential problems! Like Conch said in a post somewhere, MAF are worried about someone using a bucket they've used in the tank, to collect NSW, but dont care about a cargo ship which releases thousands of litres of ballast water (which was most probably collected over in asia somewhere) into our harbours.
Their priorities need to change. Yes I agree that some species of fish/inverts can/will cause a problem if released into our waters. Do they have to make things hard for everyone due to these few species? No, they just choose to so they can make it so difficult that people will give up and its 1 less thing for them to worry about.