I don’t mind the Marvel style of the intros. New ones still do it well.

But what I liked about the old ones was:

Perfect pacing. 30 seconds is a good length, while 50 feels dragged out.
Variety of music, with each one being fitting for its own film. Considering many people (myself included) love to marathon the movies, having them play the same music every time would get tiring.
Lack of spoilers. That’s important, I know there are still people who are just getting into Harry Potter and starting with the movies instead of the books.

I hope you aren’t upset by the criticism, and can take these factors into consideration.