I do remember reading teams projected war by Steamer and Boston was towards the top for pitching, but they were not at the bottom for hitting, after adding contreras they are about middle ground.
But you can only project with the guys you have on the roster, the Sox since I read those projections have added Contreras, and if they add Bregman or Bichette they're likely shooting up those rankings into the top ten.
absence of some very bad luck, one more good signing in the infield should make this a very good team. Not without flaws, but very good.