Lol, come on eddz99. The reason that Obito gave Nagato the Rinnegan in the first place was because he couldn't use it affectively. Madara is the sole Uchiha to activate it at all this far. He can't use his Mangekyou sharingan that effectively either because he only has 1 sharingan. He is strong because he can combine his limited Mangekyou and limited Mokuton together.