Tsunade, for her to call herself a Kage is an insult..
hmph she deserves it, she may not have been first choice but if she was a joke she wouldn't have gotten it. She has proved to me her title in the war. Each hokage has something special and unique about them that puts them over the bar and medical ninjutsu is hers. Unsurpassed.
She kicks ass and it's a shame she got her first official fight as hokage against an edo but what are you gonna do. Pain arc? Tsunade didn't even try? I sense that coming, hokage is not purely about strength which clearly is the reason why kakashi got picked over Naruto after Tsunade went into a coma.
she used her brain and knowing Naruto would come back decided to help in what she knows how to do best, nothing would have prepared them for shinra tensei. Other than that i don't see her being a bad hokage.
Only female hokage, sexist anime, she is still badass. But ofc kishi just can't make her stronger than his male hokage, hiruzen debatable but ill get flamed for touching the fodder technique spamming god of shinobi.
Anyway i think kakashi is deserving of kage ranking