When people say this it's an extension of telling people you're "not interested in politics" as a more polite alternative to "you're a windbag and not nearly as smart as you think you are, so I'd rather stick to things it's fun to talk to you about." Nobody complains about games like New Vegas and Deus Ex because they're written by people with enough education and skill to pull it off. That's why it's always the same games being used as examples. That level of writing is nowhere close to the norm.