> But at the time, there was no American film like it,
IMHO the unique stuff is mostly bad. Again whatever bad influence Die Hard had was not bad in context of it as an original release.
> Also, I challenge you to come up with a schlock-free 80s action film.
You mean with no isolated moments where you can point and say "Look, that's schlocky!" That discussion would just turn into a nitpicking exercise not worth having. Maybe I'm wrong about Commando, but Rambo is pure schlock, with no real unironic virtues. I definitely wouldn't generalize something like Aliens as being schlock taken as a whole, or if it is that kind of movie must be schlock by definition. And why would Raiders be exempt? Because it's self conscious? Well, by that standard, the least schlocky 80s action movie is Robocop.