When Scott Lang (Paul Rudd) first showed up as Ant-Man, his shrinking abilities were seen as not much more than comic relief, until he grew to the size of a building in Captain America: Civil War and became a key element to reversing Thanos’ snap in Avengers: Endgame.
Clint Barton, the expert archer who earned the name Hawkeye played by Jeremy Renner, was sort of given the short end of the stick when he first became an Avenger in the team’s 2012 first movie and was subject to a bit of online ridicule for some time after.