Enterprise is a great series, especially from Season 3 onward. However a word of warning - Don't watch the very last episode, "These are the Voyages". It's one of the worst of the series. Much better to finish with "Terra Prime" and have it go out on a high.
I liked parts of Enterprise. Disliked alot of the revisions they made to previously established trek history. (Picard's famous comment about first contact with the Klingons leading to war... until Enterprise showed up)
Even the finaly wasn't that bad, though to be honest, when I first heard Riker and Troi were going to be in it I was certain the Titan was going to be showing up from the future and taking the Enterprise back to the premier episode and stopping the whole Temporal Cold War thing before it ever happened, essentially rendering the entire series "just a dream".