So, I'm an unabashed coffee aficionado, and I don't think that debating the merits of Old vs. New World products is a very productive way to talk about things.
A good cup of coffee is based on four major criteria:
1) bean varietals and (for lack of a better term) terroir
2) the style of blend (or the quality of the single-origin producer)
For the purposes of this conversation, I'll leave the last two aside as they're location-independent.
I generally tell people to try to think about coffee like they think about wine. No one can expect to be taken seriously if they say that only France produces good wines, or than single-varietal wines are objectively "better" than blends, or that any individual varietal is better or worse than any other one. However people routinely say these things about coffee.
A light roast isn't objectively "better" than a dark roast or a single-origin coffee any better than a blend, it's the skill with which they're crafted. Admittedly, the former of each of those two options will have a more distinct character, but as we know from the human world, having a distinct character doesn't mean you have a pleasant one. Similarly, Arabica beans aren't objectively better than Robusta beans - when people try to serve me "Vietnamese" coffee made with Arabica beans, I feel very, very let down.
Furthermore, coffee is a cultural experience, rich with tradition and context. People who are sticklers for wine pairing rules are generally looked upon as outdated and sophomoric these days. I drink my coffee black, but Turkish coffee just isn't the same to me unless it's sweetened and spiced with cardamom - just as the rustic, rough flavor of hand-ground Ethiopian coffee, pan-roasted with popcorn isn't "bad" when compared against the uniform-texture of a burr grinder and within-a-degree precision of an industrial roaster. They're different experiences altogether.
If you're drinking bad coffee in the New World, it's probably due to the product you're buying rather than the origin of the beans you're drinking. An unspecified "house red" wine from a roadside diner is going to be crap whether it's an Italian or Californian winery and whether you're ordering it in Frankfurt or in Topeka.