Of course, in the context of the overarching Xindi story arc, this episode makes little sense. After all, the entire world is on the brink of destruction and the crew of the Enterprise should have better things to do than visit a few humans on a backwater Wild West planet. However, if you ignore this obvious error in reasoning, then this episode is not as bad as some commentators make it out to be.
What bothers many commentators: Why do these humans live like in the Wild West and why haven't they adopted any alien technology from their abductors? First of all, we don't know how they were able to overpower the aliens and break free. Whether, for example, much of the alien technology was destroyed in this attack. After all, they set the spaceship on fire. Maybe their ancestors still used this technology, but couldn't maintain it and eventually it broke and was then forgotten. How many tools and technology from 300 years ago are unknown to us today?
In addition: These people were kidnapped while they were living in the time of the Wild West. It seems plausible that they maintained this way of life. There are no other civilizations on the planet that could have contributed to cultural and technological exchange. You have to remember: When America was settled, many emigrants came from Europe, bringing with them their culture, their religion, new ideas, new inventions and research, and a new way of life to the new world. That's all missing on this planet. The fact that these settlers did not undergo much development does not seem completely unrealistic. Compare that with isolated Japan a few hundred years ago. When the technological revolution was already raging in Europe, Japan still had an agricultural and craft-based feudal society and samurai who fought with swords. It's amazing anyhow how this civilization could make glass. Or ammunition for their weapons. Or how horses made it to this planet.
However, it remains questionable whether 6,000 people who have built a life there, have a family and don't know any other life want to be brought back to Earth and then integrated into society. The children will certainly have no problems, but the adults will certainly feel more alien on their ancestral home planet than on this extra-terrestrial planet.