Deadpool 2 is Infinity War's near-equal, but in a different, more R-rated way. In a Deadpool movie, nothing is respected. Nothing. The 4th wall does not exist. Characters are created, just for the sake of a couple of funny lines or a spot of endearing sympathy, then are given blackley comedic, horrendously violent deaths. There is not a rule that is left unbroken, cultural or cinematic. After the first one I questioned whether they could keep the self-referential, middle-finger gimmickry fresh. They did. If anything, the only parts that fall flat are when they don't just say WTF and instead try to have a human story.
Like I said, they have done the opposite of what makes a great movie and have made a great movie. I can't figure it out, but don't ever change.