The Mana Sword posted...
Mill deck in draft requires a lot of specific cards to work effectively.
Like a Jace.
The guy running it last time I was there didn't have a jace, but he did happen to have a Frost TItan and a Gideon (which I only saw once of, and by that time it was too late).
I just didn't have enough control to run it properly. I also drafted about 15 red cards that I ended up not using because I am still sorta bad at drafting.