I'd say all of them.
Hashirama... well, look at what Madara's doing thanks to his jutsu, so yeah, he lived up to his hype.
I'd say Tobirama too, I mean, using Suiton at such a scale with no water around and with only ONE seal.
Hiruzen... at that old age to be able to fight against one of his students, a Sannin and two former Hokages I say it speaks a lot.
Minato, needless to say. I think we all know it.
Now, Tsunade, why people hate her, I really don't understand neither care, to be honest. Her hype was as the strongest Kunoichi and best medical ninja in the Narutoverse.
And was shown that she lives up to this hype.
I mean, let's take the most recent example:
Who's the one sliced in half and still alive and kickin' (up to certain extent) on the verge of her death about to heal the other kages who are less injured than her but not so alive and kickin'?
What would people want more from her? "This means I'll never die in battle" - as we can see, after the Madara battle, she's still alive.
So yes, she does live up to her hype.