Gonna try to keep this short, which will be a miracle based on how much I’ve written about LotR and Harry Potter.
First, let me admit I’ve only watched a few episodes of Enterprise. Now, when most people admit to having watched a few episodes, they’re confessing to having seen too many. I’m saying that my opinion is informed by only a handful of episodes.
That out of the way, onto the meat of it.
Enterprise is the prequel to the original Star Trek series. It’s supposed to be set at an earlier time when Earth and the Federation are not the powerhouse force in the universe like they are in the other series. Nothing wrong with a prequel, especially since there wasn’t much direction for the series to go forward after the Q plot line in The Next Generation.
The problem with Enterprise is that mankind isn’t in a developmental phase, what you’d expect from a prequel. It’s basically just a Star Trek re-imagining. You don’t see the humans struggling with inferior technology, dealing with the political implications of space travel, or any of the stuff that would make for a good underdog story. And that’s really what the humans should be in a prequel. We know from First Contact that when humans develop the warp drive, other civilizations are far beyond them, like the Vulcans and Romulans.
We’ve already seen a powerful Starfleet vessel tromping through the galaxy. Not that this is a bad concept for a show, it’s just that it’s been done. Part of what made StarGate so appealing was that humans were using bullets to fight aliens with energy weapons. The clash of technologies matched the clash of ideologies and made the whole thing more engaging. Battlestar Galactica just wouldn’t have worked if it wasn’t a story of humans on the run from a more powerful aggressor. …Though, that’s also for plot reasons.
Anyways, the problem with Enterprise is that the story doesn’t really bring anything new. Deep Space Nine at least tried the space station angle, which forced a different type of story. A worse type, but at least they tried.