I don't understand why everyone is suddenly acting like BJ Penn is terrible. If most fighters went and fought outside of their natural weight class and lost, I think that would be expected. Example: If Anderson Silva had moved up to 205 to fight Jon Jones, most people would have favored Jon Jones because of the size differences. If GSP moved up to fight Anderson Silva most people would have picked Anderson Silva because of the size difference. I don't understand why people are acting like BJ Penn fell off when in reality it was obvious that he should never have been fighting at 170 or 145. I have no doubt if he stayed at 155 he could have continued to win a lot of fights against top tier opponents.