Yes - the Schengen area is supposed to be one common immigration (for the purposes of short-term visits at least) area, but to say that there were differences in the approaches to the integrity of checks at the different national entry points would be putting it mildly.
Of course - if a border officer makes a mistake at one, such as in your case, it is naturally your fault for not ensuring that the correct procedure was followed.
Of course - if a border officer makes a mistake at one, such as in your case, it is naturally your fault for not ensuring that the correct procedure was followed.