I'm not sure where the confusion about MCU flicks being formulaic is coming from. There's a lot of room to argue about whether that's even a bad thing (given their colossal revenue generating power), but that they mostly follow a very similar set of beats that casual and fanatic audiences alike eat up and ask for more of, is undeniable.
Having said that, I have not seen any of the "event" ones that the rest feel like an over-long buildup to.