These past couple of days, I've been always queuing flex and I got 5x DPS in 60+ games, including one in the final 10s of a loss, where I didn't even make it to the point.
It doesn't really bother me, I like Tank and Support, and since Blizzard added a bunch of them when OW2 came out, so there's still a lot to try and learn.
I haven't played yet, but the music in the trailers wasn't that special.
Imma be honest though, while the music in 2016 and Eternal is great on its own, in the moment, while fighting, I really didn't care, and was more concerned about surviving and blasting demons. I just re-played Eternal, and I couldn't tell you a single music track that I remember.
Edit: Just finished the first level. By default, the sound effects are so loud, that I barely hear the music during a fight, which is fine by me. Just like in the previous games, outside of combat it's mostly ambient and no music.