Well Predators are humanoid, hunt like we do, think like we do, we can communicate and reason with them, have a very advanced version of our tech, have helped our evolution through the ages (if you count avp)... and they like beef. Its not much of a stretch. Theres alot more reason to relate to them than a creature thats born of face rape, chest bursting then spending the rest of your time scurrying around air vents and massaging people into eggs.