DC had music tailored for it's movies that still is hugely memorable and easy to remember. I can even remember precise scenes and the name of the themes associated with it. Listen to "An ideal of Hope" for example, and try to remain unmoved.

Marvel, OTOH, borrows musics that has been made without any consideration for their movies. 95% of the soundtracks I just can't remember what it was. 

Ant man, X-men, Dr Strange, Deapool (Guilty feet is the song I remember playing at the end, but it is not a "Deadpool" song), Iron man (The Black Sabbath song stick, but it's not really an Iron man song and its not as epic and unique as Hanz Zimmer), Spiderman, Captain America, Avengers (Vaguely remember the theme and its "meh"), GoTG (a bunch of 80 music that I do like a lot, but that isn't really special to the movie nor epic).

I would actually have to Google close to all of them to remember any soundtrack and none of them are close to epic and unique. And music is sooo important to any movie...