This is something I've been thinking about lately especially after reading so many Tobirama is awesome posts.
The Edo Tensei is being referred to as an abomination to the ninja world/ a most unforgivable jutsu etc. right?
Well seeing as how Tobirama created this jutsu that would make him one of the lowest shinobi in history right? I'm not saying weak but disgraceful. If Edo Tensei is such a vile jutsu why is its' creator being held in such high regards? Do all of his other feats compensate for the fact that he created one of the most disgusting jutsus in use to the bnaruto universe?
For a matter of fact it's not just Edo Tensei but that close to everything we know about him had a negative effect of sorts.
However, of course you are right regarding it and Nidaime though I always thought of him as the Danzo of his time, just not as extreme.
But being willing to go to extreme lengths to defend his village.
However his other feats easily compensate for it.
Afterall it was Nidaime who:
Built the Ninja Academy - Thus Konoha was blessed with powerful Ninja.No need to name them I suppose.
Created the Chuunin Exams - Thus allowing the Ninja of the Academy to improve by taking on young Shinobi/Kunoichi from other villages and by doing so he brought villages closer together.
He created the ANBU thus inventing a Ninja Squad who defend Konoha from the shadows.
And of course creating the Uchiha Police - Striking 2 birds with a stone.
Increasing Village safety while keeping an eye on them.
So I am sure he is a double-edged sword.
On one hand his actions are highly risky though also had benefits for the village.
I am sure he had good intentions just that things didn't work out as he wanted to.
Regarding Edo Tensei:
Sure it's an evil Jutsu but I do believe that he would have never wanted it seen to be put to such use but rather an absolute last resort Jutsu and it could possibly even be used to revive the enemy thus gathering information or letting them to be used to aid Konoha in battle.
So in the end I say Good Intentions, Partially Bad Methods but always Konoha in his heart.