Sometimes, offseason acquisitions work out. Sometimes they don't. Sometimes, they are spectacular failures.
They try sometimes. Every team tries to pick up a player for a low cost that they think could be a highly rewarding player. Boston traded a couple of spare parts to Florida for Jeremy Hermida, a player with a lot of power potential who was becoming too expensive for the Marlins. Hermida was expected to step into Boston's hallowed left field and start hitting home runs. Unfortunately it did not work out that way.
Hermida was injured a lot and when he was not hurting, he also was not hitting. Boston stuck with him for 52 games during which he put up a line of .203/.257/.348/.605 with five home runs. Not the numbers expected. Not even close. He was released and caught on with Oakland, but it appears he will never be the hitter he was expected to be when he was the 11th overall pick in the 2002 draft.