Bullshit. Predator's have survived alone on entire PLANETS of aliens. And I would venture to say that an alien is far more deadly than a SEAL.
SEALs aren't stupid, that's something that makes them lot more dangerous. C'mon, comic Aliens are a joke. Predators can slaughter tons of them, and so can humans. They lack the strength, speed, viciousness and durability they had in movies.. Single SEAL packs lot more punch than an Alien. Imagine 100 SEALs throwing their grenades at those 2 at the same time.. Hmmm, who's going to survive? Imagine the amount of gunfire..
And, besides. Predators have been bested by humans many many times before. I'm not dragging movies into these discussions because the movie creatures differ from the comic ones too much, but just to say Predator's arent bullet proof, their armor might be, but only to a degree.
So you're using a game as evidence... Riiight. My Mc was taken down by a single frag grenades, so the SEALs aren't going to have hard time with him. + Master chief does have more armor and is more durable, but he's not fast and he's not going to keep dodging bullets for long.. According to games, his shields aren't going to withstand that big amount of bullets and explosions, nor is his armor.