Netflix’s GDPR dump was kind of painful to actually make use of. In particular I wanted to port my 15 years of ratings (over 1000 movies) to Letterboxd but the Netflix dump only gives title as the identifier of the media, and some titles are VERY indistinct.
Any other information, anything else, like Year of movie would have helped. Instead I spent literal hours adjusting my data in Letterboxd’s fantastic import tool.
The dump needs to contain the data that is associated with your user and unless they store "user has rated Minions (2015) with 5" they don't need to tell you that. (Quite the opposite - it would be illegal for them to do so unless they also tell you what they'Ve stored exactly the way they've stored it)
Do note that nobody actually knows* if what I'm saying is true, but that's just another problem of GDPR
Any other information, anything else, like Year of movie would have helped. Instead I spent literal hours adjusting my data in Letterboxd’s fantastic import tool.