This modifier means everything.
He's kind of sweet. (He's not sweet at all)
He's kind of smelly. (He's got bad odor, but we'll deal)
He's kind of amazing. (Oh my god, I'm obsessed with everything about him)
"Kind of" is often used to say a thing, but rather euphemistically, toning it down, so that it doesn't look too harsh. The speaker knows that what he is saying is true, but just to tone it down he uses "kind of
Jack: Chris is such a douche!
Hans: Kind of!