I railed about Runs Allowed last year, and I still maintain it will be key for the Red Sox. They won 69 games last year. They won't be worse, because they at least won't let in more runs. The back of the rotation in particular should be much less gruesome. Not necessarily good, just not disastrous. And we can hope all the spring-training optimism about Lester and Buchholz is justified, and they both go 16-10 or something. Bullpen unexciting but better. As for hitting, the Slugging Percentage should be worse, On-Base Percentage the same or better, for a net loss of a few runs.
It's hard to see more than another dozen victories out of all that. This is an 81-win team, that could creep up to 85 if they have few injuries and some players have unexpectedly good seasons. The jerk factor should be much improved, though, and even if the love is not restored this year, they should be able to position themselves for forgiveness soon.