Obviously specific players are debatable but the general trend certainly isn't.
Unexpectedly bad or hurt, under control next year
Donaldson
Pearce
Tulo
Travis
Pillar
Morales
Sanchez
Not under control in 2018 but could be back, could be better
Bautista
Estrada
Liriano
Could have really contributed, f***ed by injuries:
Alford
Pompey
Also Grilli and Howell... but reasonable people expected them to not be very good. Hoped they would be, but I don't think there was much expectation.
On the flip side, the team has like, three or four good surprises and only of them (Smoak) isn't a stupid reliever.