In what has become a quarterback's league, the NFL has made it an extremely hard task to play defense. Offenses set records every year for yards, points, touchdowns, etc. Many defensive players are called for penalties for just breathing on a team wrong.
That's why, in this day and age, the best overall defenses make the playoffs and win championships. If your defense can get some stops and make it difficult for the other team to put points on the board, it gives your team the best shot at winning. Many teams are hoping for shootouts due to weak defenses, but rarely does that work out.
That's why eight out of the top 10 teams in total defense are either division leaders or in the hunt for a playoff berth.
These teams are feared and are in serious conversation for a Super Bowl run.
After all, there's a saying for defense: "defense wins championships."
These are the top five teams in the NFL in defense so far this year.