I believe managers should be evaluated solely on the W-L record and whether, in the judgment of the front office, the team over- or under-performed.
Thus about a month ago or maybe less I unleashed a tirade against Farrell.
All that said, I believe the manager can only do so much with the hitting. Clearly, Nunez and Devers, new last month, are making a difference. I think Farrell is doing a decent job of using those additions to improve the hitting overall, but truly believe most of it is up the players.
The pitching, I think, is a little different. Managers have a whole lot of say on how long a starter stays in, what relievers to use and in what order, how long, etc. Again, Farrell was greatly helped when DD went out and got Sale. On the other hand, Price has been on and off and on the DL, so has ERod, who has also been inconsistent, Porcello has been awful, Fister was awful until he got better the last two games (but had already cost us some losses), etc. The bullpen, the manager's most important tool, has been pretty darn good this year, and this has certainly helped Farrell. Of course, just maybe--perish the thought--he gets a little credit for the way he uses his relievers.
Back to my first point. I find it very difficult to climb on the "fire Farrell" bandwagon when the Sox are on a 7 game winning streak and 4 games up on the Yankees, 3 games on the Guardians, 6.5 on both the Rays and the Royals, etc.
On the other hand, one thing that bothers me sometimes is weak fundamentals--are so they seem to me. My favorite is the number of times Sox pitchers have failed to cover first on a grounder to the right side. These guys are all veterans. More to the point, Sale is great on the fundamentals, and he sure as heck wasn't trained by Farrell or his coaching staff.
I agree the baserunning can be bad, but, guess what, every other team in MLB does the same things. Last night JBJ ran all the way to 3b on a deep fly ball, caught easily, to left field and was doubled off of first base. Terrible. But at almost the same time Cleveland had a man on first and one man out. The batter hit a popup in the vicinity of the mound. The thirdbaseman and the pitcher let it drop between them onto the mound. The thirdbaseman grabbed it, fumbled it, and finally got the runner going to 2b. Then the SS threw the ball to first and beat the batter who had between 2 and 3 hours to get to first base safely and could not be bothered.