I dislike this episode simply because it contains Temporal Cold War nonsense. Enterprise has more time travel related episodes than Voyager, and that's saying something given it only ran four seasons. It's not the worst one by far, but it just sets prescent for the godawful nonsense to come. I could rant more... but it'd be spoiler heavy.
Phlox's bubbly curiosity was a nice change from the status quo, and I never thought it was annoying though a lot of people seem to. As for the universal translator... it's a very plot sensitive device in the early 22nd century, working at some times, not working at others.