system
A chat on subreddit /r/NoStupidQuestions
human
I think a huge part of this is the staff; they don't live/breathe the Disney ethos while on shift (in whatever role). It very much feels like they've clocked in for a shift. 

Even overlooking that, I find the Euro park underwhelming. Not just because it's smaller, but the theming and execution is lacking. The lands aren't as well defined and there's no transition between them. The rides aren't nearly as "wow". And the ration of food stalls/restaurants is disproportionately high to the number of rides and activities. 

The US park is an immersive experience, and they take the details seriously.
gpt
Disneyland Paris and Disney California adventure (when it was built) we’re built on the cheap end. This is why it is lacking. They have put a lot of funding into those parks to try to catch them back up once they realized people don’t like cheap parks.