Even IF we noticed it wasn't working all that great, we'd likely be employing a logical fallacy if we blamed that particular defensive formation.
This isn't that hard. Hypothetically an offense comes out in a base offense and they throw a pass for 30 yards. The base defense was in a 4-3. In the course of the game, this defense is only used a handful of times, and in three of the five times the offense converts a first down.
What's the conclusion? Did the 4-3 fail in this situation? How about, HOW THE HELL COULD YOU POSSIBLE KNOW THAT FROM FIVE PLAYS? What about the OFFENSIVE PLAYS that were called. There are 22 players on the field at one time, a lot of moving parts. What if the play call was a draw play that went for 15 yards? Does that mean 4-3 defenses are susceptible for draw plays? Seriously. How can you draw conclusions about a defensive set when its used sparingly in a game?
William Henderson didn't have to run people over. His preferred method was levitation.
"I'm a reasonable man, get off my case."