It's often interesting, and often irritating. It's part social psychology, part philosophy, and part evangelism for Christian humanism. But you take the rough with the smooth.
First, some interesting points:-
I didn't know 20- 25% of Australians are illiterate. (But he didn't qualify what counts as illiterate.)
Apparently 'many TV viewers can't recall a single item they saw on the evening news'. (But many people don't watch the evening news nowadays. I don't.)
One person in the world is killed in a car accident every twenty six seconds. Wow. Another piece of information that I can try to remember, or not.
Mackay correctly identifies the malaise of present-day society. It's a 'troubled, fragmented, wounded society'.
It encourages individualism, isolation and a lack of social harmony. We no longer feel as if we belong, and we become alienated, and 'that will sometimes be expressed as aggression, anger or even violence'.
I immediately thought of the rioters in the UK. Rage is sometimes all that there is. Consider the long-suppressed rage of the sexually-abused women in the Metoo movement. 'Maintain the rage' is sometimes the only viable alternative, and it's not always unhelpful.
I could also relate very personally to Mackay's description of the Baby Boomers, my generation. I know what it feels like to be an overgrown adolescent. Before I got married I didn't want marriage responsibility. I just wanted semi-permanent sexual relationships. No commitment. And I demonstrated against the Vietnam War in Grosvenor Square in London along with other Boomers. It was so much fun.
The section I found most difficult to swallow was the chapter about atheism, God, and Gods. Mackay doesn't accept that you can be an atheist. He defines God as whatever your heart most desires, citing Luther and Cupitt. That could be Reason, Shopping, Fashion, Work, whatever. Mackay says 'we all worship something'. But I don't.
And I know that praying doesn't work either, at least not when it comes to changes in society. As Bonnie Garmus said recently No matter how hard you pray that there will not be another mass shooting in the US, there always is another one.
Religion can be good, but religion can also be very harmful. Just as human nature is not inherently good, as Gabe Mate says. We can be good or bad. Human nature is open-ended.
Despite being hard-wired to be social, we can still be hateful, cruel and despicable to each other in our society. There's a burgeoning number of narcissists and sociopaths in our society. Many are doing very well...for themselves.
Eventually Mackay shows his true colours. He definitely doesn't want revolutionary change. He accepts the current economic system, and by implication, he doesn't point the finger at capitalism (unlike Gabor Mate). He wants us to listen to each other, 'just be kind', and be true to our nature.
Mackay's remedy is radical taxation reform. In other words taking from the rich and giving it to the poor. A massive redistribution of wealth by imposing increases in income tax.
It's an impassioned plea, but it's not going to work. And he clearly votes Labor, not Liberal, as if that will do any good.
Beware this book is very preachy, and chock full of generalisations. It can be very irritating. Mackay is aware that he is generalizing, but it still makes his argument weaker.