Technically, you're somewhat wrong about other countries. For instance, in France, even if ACTA had no impact on the legislation, it would still require ratific

Technically, you're somewhat wrong about other countries. For instance, in France, even if ACTA had no impact on the legislation, it would still require ratification by a law. Because, the list of treaties that require ratification is so broad in France (Art. 53 of the Constitution), that almost only symbolic agreements are exempted of ratification by the parliament (or referendum). And that's the case in most of European countries.