TL;DR of his article: it's shiny but useless for someone who needs to be productive and multitask. Oh and Unity sucks too.
Excerpts from his article I agree most with
I hate this slogan. It is the most racist and condescending piece of crap ever invented by the rich and lazy. Yes, if you live in USA or Europe, then you have running water and electricity, food is available aplenty, you rarely ever worry about dying in some horrible war, you have advanced medicine to assist your pointless eking, and you have broadband.
But 80% of this planet cannot take any of the above for granted. Activities in your Gnome won't help a starving child in Sudan nor reduce the radiation leaks in Fukushima. Get a grip. You don't need to be connected while you're sitting on the crapper. You don't need to be connected when you go for a little hike in the forest. Most of all, you don't need to be connected when fighting for survival.
So how this relates to Gnome 3? Gnome 3 does not have a shutdown button inside the desktop session. You can only suspend your useless **** and microblogging, you cannot turn it off. You are also Available, in case you need to be raped by an invading army.
Moreover, Linux Mint developers have rumored they will use Gnome 3 as a basis for their future work. Given their current success with modifying Ubuntu releases, it is fair to assume they will not follow the mainstream nonsense and focus on practicality and beauty, as they did so far. Thus, there's hope.