The Kansas City Chiefs were woeful in the early part of the season. They were mistake-prone, their pass defense was basically nonexistent, and they couldn't put much of a pass rush on opposing quarterbacks.
Additionally, the Chiefs seemed to have a pop-gun offense with Alex Smith under center. He didn't seem to throw the ball more than 10 or 15 yards down the field, and that allowed opposing defenses to pinch in and limit their offensive production.
But after falling to 1-5, the Chiefs found a way to right themselves, and they have now reeled off four straight wins to get back into the playoff race.