Fellaini is in the top 10 but I don't think he deserves to be the number 1. He's had a few decent games, but he was overpriced. Lamela on the other hand has just been total shit and hardly even plays anyway.
Lamela has definitely been the worst signing, he's started 3 league games all season. It's amazing we're where we are in the table when our Bale replacement has done fuck all.