I can't really give an opinion since I've never left Australia (yes, poor me! I NEEd to go to Europe). But, the Aussie crowds...well, we either act like total asses to the players *re. Davis Cup last month/clapping on double faults* or pick some stupid/endearing characteristic about a player to support him.
It's a lot of fun, unless you're an Aussie going for Sweden, and the guy behind you yells out 'you're full of bullshit björkman!" Anyway, most of the time its just a few people that embarrass me for being an Aussie tennis fan!