I used to watch Land of the Giants as a kid. I have just watched three episodes back to back, and the writing in them is bordering on silly. The show was not supposed to be silly or comedic at all, and it even lacked some of the lighthearted humor we saw in the original Lost In Space and Star Trek. It was an Irwin Allen production, and was supposed to be taken seriously as a scifi action/adventure
Anyway, if you have not seen it you probably won't want to. The special effects were very impressive for it's time, with the "little people" given appropriate giant props which were later on display at Universal Studios for years. There was lots of compositing with film.
But these episodes, the things the little people do are just mind-numbingly stupid. They stand there whilst a giant reaches down to grab them. They linger by escape holes and get captured, even though they would just have to duck into the hole. They run across the floor or "lurk" right next to the leg of a giant, and the giants don't see them. I think it was the fact that the separate scenes with the little people acting against non-existent giants (because they were shot separately and then composited into the scenes.
Still, this show is fun to watch if you are already familiar with it. I'm surprised they have not rebooted this yet!