Predator: Killer of Killers is classified as an "adult animated action-horror series" set in the sci-fi universe of the Predator franchise.
As a 55-year-old geezer, I'd call it a Spaghetti-western sort of space cartoon (!), but whatever you call it, it's pretty cool!
Granted, I'm only through the first third of it, but Act I was neato, yeah.
And unlike the other two Hulu reincarnations of the live-action cinematic films, this cartoon version nails the proportions/size of the predator. You know, he's tall. Like 8-9 feet tall! But in the live-action movies, the actor who portrays him looks about 6' 1", which is hardly imposing!
Anywho, nothing to get one's hackles up about. It is, after all, just a sci-fi cartoon we're talking about here, so keep those expectations nice and low if you decide to give it a whirl ;-)