Anything specific or just generalities?!
Specifics in what regard? Stupid things the ARU have done since the late 90s?
Where the f**k do we start; accepting broadcasting rights contracts with bad terms to maximise short term profits over long term growth. In the same vain, but slightly different, rejecting opportunities to get the product on to FTA in the early 00s for a few million extra a season from Fox was particularly insane.
Consistently agreeing to or accepting rules, whether they be SR's competition rules or the rules of the game, that undermined RU's competitiveness as a product in Australia to keep SAANZAR, the SARU, NZRU, WRB, northern hemisphere unions, etc, etc, happy.
Undermining or outright rejecting local growth and business opportunities to keep any or all of the other members of SAANZAR or SR happy with nothing to show for it in return, which continues to this day.
Cutting funding to, and eventually abandoning, most grassroots and junior development in favour of fruitless schemes to poach fully developed talent straight way, and all the knock on effects of doing so.
I could go on forever ages with examples, but basically every decision that the ARU has made that hasn't put Australian RU's interests first or that has been a blatant attempt to strengthen one state union at the expense of others.