User blog comment:Yatanogarasu/Gecko Moria: Weakest of the Eight?/@comment-1595565-20100701054050

I think he became weak due to his devil fruit power. Before he ate the kage-kage no mi he probably was a fairly decent fighter, but he got lazy when gained the ability to make zombies do his bidding. He let himself go because he had his zombie army do all of his fighting and dirty work. The general who does not stand on the front line is one who cannot fight his own battle. In short, his powers made him a shlub.