Double Edged Sword. While many times I am interested in the country I am in, in many cases, I'm getting info for the next country I am going to. It's frustrating to have to change a default box from where I am to where I want to go, or even not notice that it's set wrong. The real question is: how many people do I annoy compared to how many people are helped? If I help most people, and don't annoy my best customers, then that's a great idea. If my site is used by folks to find out info about countries other than their own, then it might turn out to be a bust.
I would say: test it and see.