Now that's an entirely different argumen.
You also heard a lot of people, including me, saying that the Sox needed offense and they added very little and lost even more. If the Sox signed a big bat like Schwarber or Alonso and had other people hitting in the lineup no one would care about Mayer, heck maybe he'd even be doing better without so much pressure on him.
Expecting your rookies to carry the team is ridiculous, even if they end up blossoming into All Stars.