In MLB its very hard to have a good rotation and be in last place. It just doesn't work like that.
In the regular season Starting Pitching is pretty much the first variable that impacts the win loss record. Even if one or two starters go down, it is still a decent rotation.
What is a negative is not taking advantage of a very good rotation,
Boston obviously has a better rotation, as does Cleveland, but after that I find it hard to believe anyone in the AL is better. This team will be right there in the Wild Card Race.