Good premise, bad execution. If you like seeing people make things out of scrap, it's enjoyable. It's heavily scripted, though, and it's very obvious there is no real danger. Not sure I would call it a "reality" show.
Season 1 was pretty good. Season 2 seemed less about engineering and more about the cheesy story. The finales of both seasons were particularly cringeworthy.
I'd still recommend them - I'll watch season 3.