They looked to much like typical "greys" for my taste. I also like that this episode shows that the Vulcans are right, humankind is not ready yet. They go out there and expect everybody to be friendly. Doesn't mean that they should stay at home of course.
You could argue that this culminates in the third season, when Archer the explorer has to become a soldier.
Given all the goofy time travel elements to season 3, the events triggering the whole explorer/soldier transformation probably would've happened anyways even if Archer wasn't out there the first two seasons, transmitting Earth's location to every hostile alien species.