Regarding Fugazi's influence:
What Fugazi harnessed better than any other was the power of restraint. Hardcore had been all about balls-out intensity, but Fugazi's twisty rhythms and patient calculation made the louder, more intense parts of songs that much more powerful.
Diary hovers in a difficult-to-find sweet spot, alternately contemplative and cathartic, an engrossing mix of melody, power, and atmosphere. For so many bands that came after Sunny Day Real Estate--who would essentially break up (for the first time) just months after the album's release--Diary was the blueprint.
Check it out here.