The music. The BBC having a licensing agreement with all the major record labels to just use things willy-nilly means it’s harder to have things like Hammond driving like a madman in a C7 Corvette while the only memorable piece of music in all the Marvel movies plays.
The bit of music in question, “Taking a Stand” (the soundtrack to Cap taking out the Quinjet in his “this is the closest we can do to a dragon-slaying scene until Iron Fist hits Netflix spoiler alert” scene and also the end credits and why isn’t this the Captain America theme?) from Captain America: The Winter Soldier. OK, maybe the Avengers theme is kinda memorable, but it’s no Taking a Stand.