Enterprise is the most lacking Trek there is, and the fault lies in what the creators set out to accomplish: make a new Trek, without it being Trek. But we do want to use Trek references. But also want it to be different. But we do want to have the signatory items like warpdrive, transporters, Klingons. But we don't want to give people the feeling they are watching something they know.
Basicly, the creators/writers didn't really know what they were going to do. And it shows in the first two seasons. They were trying to find a balance between this non-Trek Star Trek show they were producing.
Funny enough, if they had make a show about a group of humans in the future setting out to explore space in humanity's first FTL starship, it could have worked a lot better. Make sure it has NOTHING to do with Star Trek. A completely new, and original universe. Could've worked a lot better.