(Caveat and Disclaimer: I haven't really watched the series. Everything I've seen and heard about it has made it look like it was pretty aggressively mismanaged, and frankly I'm three to five seasons behind on the shows I actually like. (One of the few upsides of the impending closure of 'City of Heroes' is that I will finally catch up on leisure activities that don't involve Paragon City, RI, or the islands just three miles off the coast thereof in international waters.) Frankly, if a series looks lousy and sounds lousy and everyone says it's lousy, I'm not about to go watch it just so that I can verify it's lousy. So if you want to complain that I hate a show I haven't even seen yet, you're absolutely right. By the same token, I'm pretty sure that stove is cool. Go put your hand on it to be sure, though.)
So what are the two mistakes that 'Revolution' made? Well, everyone's agreed on what seems to be the big one, which actually isn't the big one relative to the truly huge mistake they made but is, on an empirical level, a pretty big mistake. They didn't define how the "no technology works" rule works. Not the rationale for it--let's face it, most science fiction relies on a fairy-chess style, "Well, what if someone could invent a faster-than-light drive?" or "What if you made a drug that stopped the aging process?" type of question. The actual physics of "What if electricity stopped powering electrical devices?" is never going to make sense.
But they needed to create an internally consistent set of rules for it. As it is, everyone's running around with crossbows except for the people who have black-powder guns and things have reverted to a medieval level of technology despite the fact that the 19th century worked pretty well electricity-free and and and...there needed to be a, "This is what the effect is and what it does, and that rules out A, B, and C but not D, E, and F." Because human beings are tremendously freaking inventive rules lawyers, and one of the first things we do when we find out something doesn't do what we want it to is we start engineering ways around it. Fifteen years of "no electricity" would lead to some pretty ingenious solutions, but we don't see those. Everyone's just given up and started using swords and bows instead of steam and clockwork.
And that's the second, much bigger sin. They jumped ahead fifteen years. The most important event to happen to the human race in a century at minimum, and they said, "Nah, let's just skip past that so everything can look all overgrown and people can run around with swords in the ruins, looking for the Lost Secret that will bring back The World That Was." Which is the plot of every goddamn post-apocalypse story out there ever. The loss of electricity has been reduced from "a fascinating change in human society" to "this story's MacGuffin to explain why humanity is reduced to a pre-industrial dystopia where heroes fight evil tyrants while looking for the lost secret that will restore the old order." This is the freaking plot of 'Warrior of the Lost World', 'Robot Holocaust', and 'Teenage Caveman'. It should not be the plot of your big-budget prime-time TV series.
The story should start the night the power went out...and stay there. It should follow characters who are trying to restore communications between cities in the absence of telegraphs and telephones, characters who are trying to keep food safe to store without refridgerators. It should follow the government's attempts to keep order without any way of broadcasting to the nation, and people who are re-learning how to light with gas and heat with steam. It should be about the tension of not knowing who will succeed, those who are trying to rebuild the world or those who are taking advantage of its collapse. It should be something we've never seen before, not 'The Postman' with the serial numbers filed off.
Ultimately, I think this explains the tepid response to the series better than the absurdity of its premise alone. It's bad enough that it has an absurd premise, but making a show with a premise that absurd only to utterly ignore it in favor of the pseudo-Hunger Games aesthetic you're more interested in writing is criminally annoying.