Life scientific theories according to Popper, which can never be proved true but can be disproved (1), games might not be able to be said to be objectively good but can be said to be objectively bad. Good requires fit for an individual, which is subjective. But bad only requires lack of fit with internal objectives, which is (more) objective.

(1) I'm not claiming this is really the case, just making an analogy to a mode of thought/concept where proof and disproof are not binary.