Mark is kind of dumb?

Hey!

So, I was talking to a friend who was watching the show, and I mentioned how Mark is lowkey kinda dumb, and how I saw that as one of his character traits. I don't think it's a bad thing, I think he's just naive and not the sharpest tool in the shed. My friend seemed kind of confused about why I'd think that, and we had a discussion about it, so now I'm curious what everyone else thinks.

Also, I love Invincible, this isn't an attack on the writing or anything. I just think Mark, as written, isn't meant to be incredibly smart, and honestly, I kind of love that.