Dude its Madara, and what would a manga be without a little suspense?
you can't expect it to all be explained right there on the spot, it wouldnt be interesting to to have seen all the akatsuki members at the beginning of the manga because it simply doesnt make sense then.
Also, if there are too many things unexplained its because naruto is an ongoing series. Flame all you want after its done, then you can bitch about the things that werent explained for you.