I absolutely loathe most American shows of this broad genre (Bones and CSIs spring to mind) because the characters are often so stereotyped, plastic and generally uninteresting that I want to puke. (Most HBO shows stand excepted.) Aussie shows often get slammed for various reasons I honestly can't fathom - Rush, City Homicide, Wildside and East West 101, to name a few, are all excellent shows. They were/are all populated by real people with personality and flaws galore, so that the viewer readily becomes involved with and can easily empathise (or not) with them. In Rush, the dialog is entertaining and natural, the relationships are complex and believable.
I have taken off one star for the weapons handling as commented on elsewhere by someone who says he knows about these things. However, for me, this is a minor detail because my knowledge of procedures and weapons is superficial and what I see (99% of the time) is plausible enough for me as a general viewer. I am more than happy to suspend belief in those areas - I just want to watch a show with the right mix of drama, action, characterisation and dialog. I LOVE all those aspects of Rush. And needless to say the acting is of the usual extremely high Australian standard - Catherine McClements is a standout in a generally superb lineup of talent.