It shows as a 51% win rate to me.
The comments here about OTK DH being a "hard deck to pilot" are silly. You can play it a few times and get the idea very well like with any deck.
Remember, the WR you see is for all decks running that card. There are still many soul fragment decks running it, even after the nerf. There are aggro decks running it too.
It's a versatile enough card to be useful in most DH decks. Seems like a safe enough craft if you like DH.