Now that I think about it, if Naraku considers himself so powerful, why does he rarely participates in battle directly. It is always relying on some form of trick or complicated plan.
Fight against Sesshomaru: Intends to devouring with the nature of his body
Kikyo confrontation on Mt. Hakuei: Wanted to finish her off with his Miasma.
Last Shard Mission: Wanted Inuyasha weakened before finishing and taking the shard from the jewel maker.
At the end he is a very good plotter, but nothing else even with such a powerful body at hand.