well , he didn't participate on Defeating Juubito , compared to other hokages , he couldn't stop madara , , or any bijudama , saving anyone , .... unlike Tobirama and minato , who helped on defeating juubito , helped sasuke and naruto , all 70k shinobis , tobirama gave time to gaara and naruto escape from madara , minato saved everyone from bijudama , ...I see it, but why is Hashi so low?. I think he was the main motivator for everyone. he should be number 1.
and comparing their strength with hashirama's strength , hashirama failed !