From the perspective of storytelling, one could argue that failure for our superheroes had been inevitable in the movie, Avengers: Infinity War. The Russo Brothers had recently offered a few clarifications that we can blame Star-Lord for Thanos’ victory.
While speaking to Collider, Joe Russo had reflected on Peter Quill’s blunder while on Titan, when the Guardian had failed to keep his cool and also thwarted all the plans. While the director had defended Star-Lord’s actions before, he admits that the moment had been crucial:
“That was the turning point of that scene. Again, these are flawed characters that make emotional choices, human choices [and] had Quill not done that, the movie might have ended right there.”
A flaw in this character is not a flaw in the movie, and as Russo had explained, Star-Lord’s mistake had been understandable given the emotional condition he was under during that time. What is more, is that Peter had been the only hero whose screw-up costed lives of half of the world. Thor draws derision for his failure to go for the head, and this is another error that had been made because the character was in a pretty emotional place.
The superheroes probably will not be feeling any less stressed after the events of the movie, Avengers: Infinity War, but it is surely safe to assume that they will turn the tide against the Mad Titan when Avengers: Endgame releases.