I've found a couple of links to quick reviews which may be worth looking at. I'm sure there are more and it is probably looking over at the 'Philip Quast Guide' to see what they have got :)
http://www.dailytelegraph.com.au/entertainment/arts/a-spoonful-of-sugar-is-administered-to-sydney-audiences-at-mary-poppins/story-e6frexmi-1226051262888
http://www.watoday.com.au/entertainment/musicals/extravagant-family-entertainment-in-this-nanny-state-20110506-1ebuz.html
UPDATE: A couple of extra reviews of MP from last few days. Links below:
http://www.australianstage.com.au/201105064399/reviews/sydney/mary-poppins.html
http://www.aussietheatre.com.au/index.php?option=com_content&view=article&id=1457:the-standard-remains-high&catid=38:straight-to-the-point&Itemid=58
