The advertisement campaigns have been rather on-the-nose and pretty mainstream styled. The game has never felt like "haha le rock music".
I've played the game just about since launch. I've enjoyed every bit of the game, even in Vanilla. I don't think I ever went in with massive expectations. I never really saw a whole lot of the stuff they promised before launch and went in rather blind. The game has changed a lot since Vanilla, some to the chagrin of others because a lot of it happened through DLC, but I was enjoying each installation. Rise of Iron capped off D1 with a lot of the best QoL updates for the game, until the next title. Destiny 2 is going to be the best version of Destiny, hopefully learning from all the mistakes they took in D1, and it will hopefully only get better still.