I've heard a lot of people saying they get exotics in about 3~4 runs on Hero, and 2~3 runs on Legendary.
I've got 29 ordeals done, in the following breakdown:
1 Adept
24 Hero
4 Legend
And out of all of that, I've gotten 1 exotic so far.
Yup
1
It wasn't even a good exotic, it was Eye of Another World.
So, what have your drop rates looked like so far?