Why do most say that the NFC is a weak conference?

In the 90's the NFC was the dominant conference until over a few years most of the star players were injured, benched, or forced to retire due to injury. During that time the AFC was beginning to put together a some what compatible team. While they were getting better, the NFC was doing the same thing the AFC was doing, trying to rebuild their own teams. It has been a lopsided event for both conferences. But I think both sides are just about even, so it will be an intresting year