To sat how awful The Shield is, you'd have to write pages and pages, so suffice it to say that it is a monument to bad directing.
"When Directors Go Awry" should have been the title of this production. Indeed, directors are supposed to infuse their work with a sense of visual style and story-telling that propels the story forward.
How is constantly shaking the camera and playing with the zoom lens a "style"? How is it propelling the story forward? Of course there's also the "editing by random numbers" nonsense. Apparently it's become hip to just cut randomly.
I guess it's too much work to do good editing.
Well, that made it too much work for most people to watch The Shield which languished as one of the most over-hyped and unwatched shows of all time.