Many movies have a sucky ending, so reading about this movie would not be what many people would expect. Avengers: Endgame.
Yes, it is one of the most loved and watched movie franchises, and believe it or not, the last part had a sucky ending, well, for me at least. Based on a series of comics, this movie franchise has won a lot of hearts.
The end of this movie begins with the war.
As per the comics, Nebula is the one who clicks her fingers and kills Thanos. In the movie, as they bring back the infinity stones, Banner, a.k.a Hulk, wear the glove and snaps his fingers. After which Barton receives a call from his wife, which is the director's way to tell that the Blip worked. Later Thanos arrives, and the whole chaos comes into action, and everyone fights. In the end, it is seen that Tony wears the stones on his Iron Man suit with the agreement of Dr. Strange, and then he snaps his fingers. All of Thanos' troops are turned into dust, including him.
The stones with his Iron Man Armor attached gave him a little more strength to survive some more time before he dies. And he died! Then there is the funeral, new ruler for Asgard, time travel again to put the stones back where they were, and Captain America's retirement.
Let's see how it could have ended rather than its original ending.
We all know that after Banner tried on the glove, he made sure everyone knows that it's just mainly gamma rays, but he burnt his arm in the process. So obviously, he couldn't have been able to do it again in the end. Nebula is not seen during the fight, so the comic ending would not have happened. On the other hand, Captain Marvel was pushed somewhere in the sky by Thanos, who used the Power stone to do so. Although, with her strength, she could have been the one wearing the glove/stones and wiping Thanos and his army from the face of the universe.
How? When Thanos punches Captain Marvel into the sky, and a few seconds later, we see Iron Man fighting to take the stone glove, whereas he just takes the stones. What could have happened instead is that Iron Man would have fought for the whole glove, and by that time, with captain marvel's speed, she could have reached and snatched the glove from Thanos' arm and finished the mission.
With this ending of the fight, Tony, who asked for a promise from Captain America assuring him that he couldn't risk what he has now, could have stayed with his daughter and family. Everyone would have been reunited with their friends and families, especially Tony who was hesitant in the first place of doing this.
"But then again, that's the hero gig, right? Part of the journey is the end."-- Tony Stark.