I always like these GUNMM-like post-apoc dystopian worlds in manga. Maybe there's something about the Japanese take on it, but I love these things, and am not too fussed about the Western iterations like Fallout. Then again, I may not like Fallout because of the 1960's Americana themes. Doesn't matter here anyway.
One of those seinen about a gun-for-hire/mercenary types, set in a post-apoc Japan, which is now a massive desert for some reason.
And it's kinda great. Pretty original aesthetic and art to it, or just familiar to old school seinen fans maybe. It's hard to pin down what I like about it so much, but I suspect it's how a lot of stock pieces of storytelling came together pretty neatly. A main character who uses mind games and dirty tricks instead of brawn or pure intellect is almost always refreshing when you come across them, since they're fairly rare. A main character who's also a right depraved piece of work - that you still root for, for some kind of "he's the underdog here" logic - reminds me of Yongbi in that way to be honest, although Yongbi isn't an underdog, he's just awesome and hilarious.
And this I think is the main success of the manga. It's very funny. The fights are funny, because Desert Punk outwits his opponents in the most humiliating of ways, and sometimes vice versa. The parts of the story are funny, because Desert Punk's terrible, terrible personality comes to the surface and some hilarious reaction or insult will ensue. It's also satisfying to see a piece of work like him get into trouble once in a while because of his innately humongous greed.
The stories are all pretty fantastic too - mostly little standalone arcs revolving around different jobs - so far (around vol 7/chapter 37) - with a cast of a few recurring characters who are just about as funny and despicably "look out for no.1" as the main character is. It's an extremely dog-eat-dog setting, and we just don't have too many things in that vein, so I like it for being a fresh wind as well.
As for the "This manga tries to convince you that the most logical approach to life is to have ZERO EMPATHY for others, that being a psychopath is normal and desirable" way of looking at the manga - just no. Seriously no. This manga tries to entertain, often by pushing hard at the borders of acceptability (welcome to seinen, we have cookies) and with black humour. And ecchi, one must admit. Again, welcome to seinen. Not every story is a morality play or tries to teach a lesson about how to live life. Some are out to provide escapism and entertainment only, and that's basically what you should be looking for here.
And I think it achieves that pretty damn well.