Thanks for your answers. You pointed out some details that I definitely wasn't taking into account.
So let's think of this example
Say there is a guy in Colombia (spanish speaking country), with his browser configured in chinese.
He is using google.com, searching for a term in polish.
There are 2 sites that are targetting that term.
Both are written in polish, have the same meta tags for polish and are hosted in Poland. They have exactly the same domain name, except for the extension. Site A is blablabla.co.uk and site B is blablabla.co.in. Let's assume that the links they have are more or less the same.
Loads of people on the internet would say Google.com will favour site A. Of course, many of them are actually in the UK, so that might be the source of the misunderstanding like Andy pointed out.
But sometimes I get the feeling that in the case of our colombian friend that I just made up, google would still favour site A. So I started to wonder whether it's true that G will consider a .UK site more reliable than an .IN site, or it's just that UK people have more money to spend on stuff so generally they tend to have better SEO, therefore giving the wrong impression that google is favouring site A when in reality site A wins because it tends to have better SEO.
And, sorry for this SAD SAD SAD post!