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For me, it wasn't the polarity of the team structure that stuck out, but the homogeneity of the hitting as well. The M's continuously run a lineup that is one-dimensional, which makes it difficult to 'solve' the opposing pitchers. It's one thing to have good hitters, but it's another to have hitters who have similar profiles with similar weaknesses.
Reducing the diversity of the lineup is like not mixing pitches. It makes it easy for opposing teams to stick to one game plan, as opposed to having a game plan for everyone in the lineup.
The M's are simply a team that pitchers can easily get into a grove with.