Well, first both of them were replacing absolute zeroes in our lineup, 3B and LF. So just by having a breathing major leaguer there you hoped it would be a significant improvement. Also, Sandoval was an average 3B and Ramirez was moving from the hardest position on the field (where he was below average) to the easiest, so you'd like to think those were plusses. Throw in the fact that the Red Sox were 3rd in the AL defensively last season (h/t/ fangraphs) nd the ingredients were there for a positive defense. And what has happened is that by going from ++ to ok (Vasquez to the others) at catcher, and then Sandoval and Ramirez being well below any reasonable projection defensively, the team has fallen. (6th in the AL, but worse on an absolute basis than last year).