Your overall point is fair.
That said, terrible in MLB is way different from terrible in the NBA or NFL or, I suspect, the NHL, which I don't follow. Why? Because the worst MLB teams can still win games. Right now the Tigers win a little better than 2.5 out of 10 games, which is pretty awful. The Sox have the 2d best winning percentage in MLB and win 6 out of 10 games. Odds are good that the Tigers can take 1 of 3 games vs. the Sox if only because the Sox cannot consistently win even 2 out of 3 games. Thus the Tigers had a shot last night when our BP imploded. Indeed, the Sox needed two minor miracles to win. Cabrera needed to hit into two GIDP's, the 2d one with the bases loaded and 1 out, and Barnes needed to get a super save with 5 straight outs and no runs scored--including Cabrera's GIDP in the top of the 8th.
The numbers say Pivetta is so far one of the Sox three best pitchers, but he could also fade faster than a Chris Sale in August.
I don't like Dalbec, but his success at U. Arizona, Portland (AA), Pawtucket (AAA), and Boston (one month last year) say I'm wrong.
The bullpen is beginning to look like the Disney version of Night On Bald Mountain. Scary.