First it gives you a popup saying i'm not in the US and would I like to visit the global site?
In my experience that means they send me to the other site that doesn't even have the article i clicked to, or even if it has it they can't redirect me to it.
Very much depends on the site - certainly there's plenty that are annoying in the way you describe, but there's also plenty (I wouldn't be surprised if either side were the majority) that will take you to the exact same content on the more local version of the site.