Useless characters, bad pacing, overused flashbacks, and I mistakenly watched all the filler. Still good/decent though with redeeming qualities like some of the main characters, good fights, and arcs.
I didn’t fully understand what the show meant when I first watched it in high school. Now in college, NHK is clear as day in my eyes, and I relate to it very much. The issues and problems it tackles hit harder now being a depressed and confused College Student.