My recent one: There are too many trailers before films now.
Why? I went to see a "Sorry to Bother You" showing at 10:00PM Tuesday before last. It is 1:45 minutes long - 1:40 if you leave when the credits role.
Issue: They had 23 minutes of trailers on before the film! That's a cool 22% of the length of the film to see trailers for other films.
(It din't help that all the trailers were in the exact same lane - someone in Oakland or Chicago who started/brother started/friend was killed by some who started the big time drug game in their hood.)
And if you see a Pixar film you gotta sit through at least 10 minutes of a film that isn't even the film you wanted to see!