I have no idea how to answer that question.
If you are referring to humor, I grew up on 80s movies, so there should almost always be humor involved.
That being said, that doesn't mean the games are silly. Real life is full of humor, and it's pretty far-fetched if your game world isn't.
But I'm not sure if that was what the question was about.
If you are referring to commitment to the goals of play, I take it very seriously. I'm a person who, if I have a plan for an activity, we do that activity. D&D is the same way. We've got a plan for what a campaign is, and everyone is expected to be serious about that, whether it's immersive role-playing, solving mysteries, or just chopping up monsters.