Seriously wedive do you not have anything positive to add to these forums? Reefballs are anything but "manmade junk" they are a tried and proven product used successfully worldwide! Perhaps you hadn't seen the Sidney waterfront before the addition of the reefballs but it is substantially better than it was and while there is a nice display of sealife on the pilings, reefballs don't leach toxic and/or carcinogenic substances into the sea! As far as Ogden Point goes, the reefballs are being placed away from the breakwater not against it. They will form a reef that will be enjoyed by countless divers and will provide a classroom setting for courses.
If you don't like them don't dive them but please do some reading before expressing your opinions on forums as widely read as these are. See
Reef Ball Foundation Designed Artificial Reefs for an incredible amount of information about reefballs around the world.