All of you do realize that these kind of power did not existed in harashima time or madara time period. The bijuu did but not them fusing with human host.
Madara nor Harashima never tap the full capbalities of the tail beast in their era, they only control them.(big difference's that fusing with them.)
Beside Naruto's and all the other shinobi powers have gotten much stronger and different kind of jutsu were created so you can't say those things. For example i bet Madara shit his pants with he saw the little guy split two meteor rite without any help. see what i mean? people advance in jutsu and skills.
SO Naruto>Madara>Harashima....Main reason why really most will say it's cause he is the Main character. but in reality is like this, no one never saw how Harashima fully abilities were, and the fight with Hiruzen can't be used either because they didn't really seem op. But there is a saying the new generation always becomes stronger (kakashi stated this many of times):flaw: