I don't know what the first reviewer was expecting, but if you're a nerd, you should be well-acquainted with "lowered" (i.e. realistic) expectations. True, nerds come in many flavors, so a reality-show competition is going to be putting up apples against oranges, but so what? What are you going to do, have them all sitting around the campfire, singing Kumbaya and giving speeches about why they're nerds?
Look, it's all in fun, rather tongue-in-cheek overall (losers are "destroyed" by special effects as they leave), although it's serious enough for the contestants, apparently. And really, is it any surprise that someone whose only claim to being a nerd is being a cosplayer can't compete with rocket scientists, chemists, or even dedicated/pro gamers who are also up on all the sci-fi shows and fantasy books?
It is unfortunate, sad, and ironic that there is a "popularity contest" aspect to it, even if it is popularity among fellow nerds, but then, it is entitled "The King of the Nerds," not, "The Nerdiest of Nerds." The final decision comes down to a head-to-head contest.
SO, if you're nerdy, like or are interested in sci-fi, fantasy, science, video games, LARPing, cosplay, musicals, logic puzzles, math, tinkering, robotics, horror movies, superhero comics and movies... I call this a "must see" show! Imagine you are one of the competitors -- match your knowledge to theirs -- cheer on the one most like you, or that you like for some other reason. Just don't get too emotionally attached or take anything too seriously.
Enjoy being a nerd!