2. J.D. Martinez
The Dodgers needed to replace two infielders this past winter with Trea Turner and Justin Turner finding new homes. Prospect Miguel Vargas served as one of the replacements at second base (allowing Gavin Lux to shift over to shortstop before his ACL injury) while J.D. Martinez served as the JT replacement.
While Martinez likely won't play defense at all this year, bringing him in to be the full-time DH allows Max Muncy to eat innings at third base, replacing JT in the process. On paper, this looked like it was going to be an excellent move by the Dodgers.
Muncy got a more consistent role in the field and Martinez was coming off of a better season than Turner. Not only that, but Martinez's ability as a southpaw masher had a lot of value on a lineup that struggled against left-handed pitching last season.
Martinez has not had the kind of start that fans were hoping for in the Dodger blue. The Dodgers' DH has logged the most at-bats this spring and has struggled with a .200/.234/.289 slash line. Martinez has hit one home run and one double while striking out 13 times.
Los Angeles really needs Martinez's power-hitting bat in the middle of the order, and while he may not be in his prime anymore, he easily should be able to replicate, if not improve, on what JT produced last year. If his cold spring continues and he cannot do that then the Dodgers' lineup will objectively be even worse.