As always, Traveller's Tales does a fantastic job of building a world around LEGOs. Between minifigs that look like the toys you can buy in stores, and the settings that they run around in, Marvel Super Heroes 2 looks like something that a collector might just be able to build on their own. Granted, some of the moves that the minifigs can pull off are far outside of what the physical toys can do, but when you have heroes like the super-stretchy Ms. Marvel (the Kamala Khan version), some liberties need to be taken.
Audio-wise, the game's characters' have appropriate sounding voices, and while none are trying to impersonate the silver-screen version of those characters, many are close and convey the same attitude and style that those characters have shown in the MCU. Mind you, LEGO Marvel Super Heroes 2 doesn't try to conform to the MCU in any real way, outside of heavily using characters that have become more popular because of those films, so again, liberties taken in this department are just as reasonable as the ones that allow Ms. Marvel's body parts to become so unLEGOlike.
The game's background music also feels right as action sequences are put to high tempo music, while exploring the city often has a more majestic and slower feel. LEGO Marvel Super Heroes 2 also takes advantage of the fact that the Guardians of the Galaxy have become popular since the first game and, when appropriate, uses classic 70's and 80's songs while Star Lord is present, though these are in specific cases and not just a part of the general background music.