There are a lot of standalone episodes in ENT's first two seasons, but there are some arcs forming even there too.
The Andorian arc, for one. Which is a recurring story throughout the show which I found very enjoyable.
The terse relationship betweens Vulcans and Humans is another
Not to mention the early conflicts between Earth and Kronos. I think the first few encounters with Klingons are consistent with Picard's 'a disaster that led to decades of war' line in TNG.
The Temporal Cold War was a misstep, and not very well plotted. But in that arc, there are some very good episodes. Future Tense, Cold Front, etc.