Action, Adventure, Fantasy
In the trailer, Steve Rogers says "together". Tony Stark replies "we'll lose". Rogers in return says "We'll do that together too." This was taken from Avengers: Age of Ultron (2015).
Fun isn't something one considers when balancing the universe. But this...
Thanos: ... does put a smile on my face.
When the Marvel logo appears, the Avengers theme is heard.