In my headcanon, the Predators we see in the movies are just the uber-macho ultra-violent toxic-culture types who are hyper-fixated on hunting.  It would be one thing if a human defeated a Predator once.  But the number of times we've succeded?  It's because we're not really seeing the best-of-the-best.  We're seeing the Walter Palmer types to pay to go on safari and shoot a trapped lion.
We've never seen the Predator homeworld (in a movie).  I want to see the day we first travel there and land in front of huge monolith, only to discover it's basically a giant office building.  We are warmly greeted by a Predator secretary, and when we start talking about our first encounter with a Predator the secretary is like "Oh, jeez.  Are you talking about Steve?  Yeah, we all hated that guy.  Never shut up about his tacti-cool toys.  Actually, when we heard about that we started a petition to protect your planet as a wildlife preserve until you acheived space flight."