I liked this show for a couple of seasons. The blurred-out bodies are a little silly (America, the land of the prudes), but you get used to it, and there is something fascinating about people undergoing these remarkably grueling expeditions without even clothes. It makes you realize how important clothing is in a hostile environment, especially shoes.
But the main thing I think when I watched was, these people are out of their minds. I understand wanting to be on Survivor. It's tough, but you've got a chance at a ton of money and celebrityhood, you get interesting challenges and rewards, and it's scenic. But in N&A people are just suffering. Some of the shows are set where even ancient natives wouldn't have been willing to settle, like the Louisiana swamps. These people go out to terrible places, knowing they might not have food and water for days, knowing they'll have no protection from the elements, and I'm sure they don't get a million dollars or even get that famous, considering it's the Discovery channel. (Although those who teach survival skills might see it as a way to gain students.
Admittedly, some of these people clearly weren't prepared for how terrible it was going to be, and some are good enough at surviving that they actually seem to manage pretty well, but still, these people are insane. One guy even said he'd like to come back and do it again!
Also, admittedly it's probably all exaggerated. Reality TV is known for creating a false narrative and exaggerated drama. And the series is, unfortunately a little too focused on reality-show drama, with too many random shots of dangerous beasts and played-up drama.
Overall though, I found it entertaining for a couple of seasons. But after that it was just the same thing over and over. Still, it's worth checking out if you like reality shows.