This is a fantasy sitcom about two guys who get stranded on an island. One guy desperately wants to get off the island, while the other wants to stay and enjoy it. They build ridiculous contraptions in their efforts to either stay or to enjoy themselves. The two guys happen to be Richard Hammond and Tory Belleci playing themselves.
OR
This is a parody fantasy version of what would happen if Richard Hammond and Tory Belleci got stranded on an island together.
Once you realize what this show is, you might find it funny and cute. If you sit down thinking that it's a documentary / reality show / builder show, like Top Gear, Grand Tour or Mythbusters, you're going to be disappointed. It's a fantasy TV show. Or it's a parody. Or it's Gilligans Island where Tory and Richard play themselves. After I accepted that, I enjoyed the stupid humor and binge watched the whole season. I hope they make more. I've enjoyed Hammond and Belleci over the last 20 years and thought they were fun together. I hope they make more of these or that they do some kind of other show together.
The negative reviews are really the result of expectations minus reality.