I find it a little odd that Gamespot is associating a comedic tone with "grade school humour" and a lack of "nuance and subtlety", that doesn't really make sense to me. Just because a piece of media has an overall lighthearted tone, that doesn't prevent it from creating subtle and creative writing, world building, or anything in between.
There is a lot of effort and nuance put into details in order to help make this sort of design work, and I don't recall very many crude jokes in Saints Row 4 if you choose to avoid those elements. Interesting tidbits can fly over peoples heads, but subverts tropes and allows for interesting design and new styles of stories.
Also, adult humour doesn't necessarily mean unintelligent, so I don't get where that came from either. Some of the most intelligent, articulate, and clever writing you can find has come from adult cartoon shows, so I don't see why that juxtaposition isn't possible with games.
I recall there being a lot of "nuance" and "subtlety" if you look at the word definitions, distinct small changes in expression, style, meaning, sound design... Clever indirect forms of writing and presentation... I really appreciate the effort put in despite difficult constraints.