Sorry, I didn't actually read your post because I knew what you were going to say regarding the whole "but it's there!" deal.
It isn't there.
Wolf does kill Aliens, yes.
Wolf does dominate those Aliens, yes.
No, Wolf is not a good fighter. He's beating up paraplegics.
As for the long ranged thing, yeah. Stop, grab a disk, open it up, and throw it, and pray the Alien doesn't do anything while you're doing so (perfect if it was in AvPR), or react immediately. As for cutting off the tail, that was smart. He took away the Alien's advantage and, as you see, Aliens have acid blood in AvP. Stabbing it while it was above him would've got him seriously burned.