Well, see, that was the mistake
Enterprise's producers made - they worked too hard on maintaining continuity with the older shows.
They really didn't. They just maintained intra-continuity to THEIR shows, cause Berman, really. They were too self proud to believe they became Star Trek and that was their mistake, they lost so many opportunities technology wise(like with Pulse pistols instead of Phase, needless transporter, needless photonic missiles etc), as in they cared too much about their trek, when a great deal of fans did express their desire to see something different.
And of all the Trek Universe they've shown what they thought would be popular regardless, like Borg Ferengi and the like. In the meantime, they forgot(?) to give the same gravity to Storytelling and the amalgamated universe was lacking both in originality and excitement. So it wasn't that much viewed
and if I may say so, when they have seen they couldn't save it they effectivelly sinked it themselves to get their own way.
Enterprise will always be the lost chance of B&B to make something original deviate alot from the original with an explanation and tell their stories. Somewhere along the road they forgot
Star Trek isn't its technobabble or its aliens alone(especially during that specific timeframe). For the most part you need that after a point, for which obviously a level of continuity has to be maintained(excluding ENT, always, as it was so close to our time you could get away with it and it wasn't that needed) as in y
ou make a cop show, people expect to see policemen uniforms and not astronauts or marines and vice versa but you always need good story telling and fresh ideas, OR at least clever re-uses of them to appear this way.
This was ENT's main fault. And when it improved, it was because of storytelling, but keeping the level of CGI and lore to a fine level and adding continuity to acceptable levels and not the producer's distorted idea of what continuity should be.