The Wire. It's the only show I've watched more 3x and it got better with the rewatches. No show has come close to the raw grit. I may be biased because I lived in Baltimore for a few years though.
I think most TV shows overstay their welcome when they go past 5-6 seasons and run out of ideas.
Better Call Saul and Breaking Bad are my next two favorites.
Watching The Matrix in theaters in highschool. I genuinely thought I was in the Matrix myself and almost got hit by a car walking out the theatre. I wonder sometimes what would have happened if that car hit me.