Do you deduct points for a lousy mode?

[Veknoid_Outcast]

Question for you guys and gals:

Do you lower a score for a game if it has one great mode and one bad mode? Or do you treat the bad mode as a bonus that needn't affect the overall score? For example, let's say game A has three modes. The multiplayer is fantastic, the co-op is OK, and the single-player is dreadful. Does that single-player drag the score down? In other words, would game A get a higher score if it didn't have the single-player mode at all?

Let's call this question the "Mario Kart 8 battle mode" query