Liked Deadpool 2, it will always be good to the people it is good to now. Such is the way of many movies. Even look at say, Terminator. The time it is set in is foreign to younger viewers and they may have a problem getting into it.
It's actually a /rare/ movie that survives the transition of time.
Saw Infinity War finally, was pretty good, but if you haven't been caught up on /all/ the recent marvel movies, (Black Panther, Captain America Civil War, even Iron Man 3 to an extent) it might be a little jarring and create some disconnects.
(ETA) And Thor: Ragnarok, and Guardians of the Galaxy, etc.