system
Given the following post, respond as if you're commenting on Reddit:
human
[Warhammer:40K]How powerful is your average Ork?

I'm not the most versed on 40k, but take a bog standard ork that fights en masse against humanity. How powerful is he? More than a match for say, a modern military force?
gpt
Orks were genetically and psychically designed by incredibly powerful, ancient beings called the Old Ones. They were designed, at their most fundamental level, to be unwavering weapons of mass destruction that would fight against the threats they didn't have the time or resources to deal with at the time. 

Very little about Orks is "natural"; they didn't evolve into their current form, and as such, none of their genetics are wasted. Virtually every aspect of their being is tailor-made to assist them in any combat scenario they might find themselves in. 

So let's compare your average rank-and-file Ork to an average Human. First of all, the Ork is HUGE in comparison. Orks are often a little bigger than your average space marine, so they would tower over a regular person, even with their heavily hunched posture. Their strength is magnitudes higher, and they could probably easily rip your arms from their sockets. Their durability is tank-like; small-arms carried by standard soldiers would be like airsoft guns, and they can lose limbs without being slowed down. They require no training to become effective combat units, they require virtually no supply-train to maintain advancement, and they can essentially "magically" create vehicles and weapons out of garbage. 

Every facet of their culture revolves around war. Every one of their loves, aspirations, desires, goals, and most of their "leisure" is singularly focused on something war-related. 

A modern military force could deal with a single Ork, but if they weren't initially prepared for it, it would be a brutal learning experience.