Since The Avengers, humor has come to the forefront of the MCU, and each movie has the pressure of not taking itself too seriously.
As such, some of the heavier movies might need to enlist some help to keep it light; this is exactly what happened with the upcoming installment Doctor Strange.
These expectations include, but are not limited to, creating a memorable villain, action sequences, a story we care about, and lots of humor.
In addition to the pressure of adapting beloved comic book characters for the silver screen, there are also certain checkpoints that every MCU movie is expected to complete.