Hiruzen, not to be a hater but that old duffer did more bad than good... 1) Letting Danzo in, WHY?! Danzo walked all over that idiot and why didn't he stop Danzo from getting all those Sharingans... Even if he didn't wanted the massacre, atleast make sure to destroy the evidence but NO! Both Obito and Danzo got what they wanted
2) Orochimaru - Not to say Minato failed too as a sensei but atleast Obito had an accomplice with MAdara (And was a good boy).... Orochimaru was pure evil and killed many shinobi's as Hiruzen found out but did nothing... Now, I dunno how it works in real life but even if your best friend murders innocent people, for fun and has evil intentions to destroy your village, then as a chosen Hokage with responsibilities you eliminate the threat... Hiruzen did nothing!!!
And by the way, don't bring up the Madara bullshit, cos Madara never killed any shinobis infront of Hashi, infact Hashi was willing to end his own life for the alliance... Gotta give respect for that... When did Hiruzen put his life on the line to save the village.... OH YEAH! He sealed Oro's hands! (BRAVO! Clap.. Clap.. You did it... Did he really thought Oro was never gonna get it back lol)
Hiruzen was an old duffer who smoked some funky shit man!