if you really think about it, all manga work that way. the person has a special move that they spam. Goku was spirit bomb, luffy ,is just a increasingly more powerful punch, or kick. NAruto is his rasengans. You cant honestly expect a character to keep using different moves all the time, it would be kinda boring. Manga characters have their signiture moves. Deal with it. Uchiha spam sharingan/ms techniques. Sakura spams punches, naruto rasengans kiba his gasuga hyugas gentle fist, etc. So the same techs will be used always. It is how they are used and the timeing and what led up to their usage that makes it interesting or boring. Edo tensei at first was cool. Then it was epic, when kabuto made an army, and revived kabuto. then it became kinda stale when madara stuck around, and the edos got beat more easily. Now it is exicting again because with the exception of tsunade, all the hokages are back. And the reason it is so exciting, is before when they were first revived, we knew nothing of them. Now we know how op they were, and we want to see more of their abilities.
But the hokages being revived(at least hashi) was pretty obvidious to me that a hashi like figure would begin to fight madara(as he said like 5 times only hashi can stop me. It was all but confirmed it would happen, when sasuke talked about the ones who know everything, first in the singular context, then in plural. So it had to be a group, and then oro refered to them as the members of the group. Also suigetsu randomly knowing about rds was a big give away.
edit:
im going with interesting plot device. And i understand where you are coming from.