I actually like the Australian: it has a better combination of thoughtful left-wing (Nikki Savva, Peter van Onselen) and thoughtful right-wing (Greg Sheridan, Chris Kenny) views and commentary than other media organisations. And I'm a bit of a leftie (and a Union member too) who's no rabid conservative. I just hold the quaint view that no matter what my politics, I should be open to reading, and engaging with, the views of intelligent, thoughtful people who I happen to disagree with. Other media organisations such as the ABC (which I also get my news from) write off The Australian as right-wing trash; but in my experience that's a highly unfair criticism.
As for the other Amex platinum benefits, I appreciated the $400 everyday credit, which Amex has provided for two years running. And my wife and young adult children, who all have supplementary cards, LOVE the fact that they can use the Virgin lounges even when they're not travelling with me. I've also gotten probably $600-$700 worth of Accor benefits this year.
My Union membership also gives me the Platinum card for $1200/year rather than $1450.
So for me it's a no-brainer. I'm keeping my card, for the time being at least.