To me and basically everyone in Poland McDonald's was anything but affordable since they started serving their slop here

Yeah, that seems to be the case for a lot of non-Anglo countries, it's similar in the Balkans. We already have our own fast food traditions, so the various American franchises are more like imported luxury food (well, luxurious by fast food standards anyway), nothing like the way they're viewed in their country of origin. Although I assume there might also be some genuine differences in the product due to food regulations (I think the EU had a ban on some growth hormones that are used in American beef), plus just the practical factor of which ingredients are more easily available locally.