I disagree.
It should have ended with floch and the other yeagerists sinking the boat and winning.
I don't think eren was the main problem when there almost every single character in the series is far worse than him.
The retarded part is the absurd amount of plot armor that armin and his team of fags had.
When the yeagerists fought against the coalition you're telling me not a single one of those niggas even tried to shoot one thunder spear towards the boat? You know the fucking thing that would ensure victory if you destroyed it? But no not a single yeagerist decided to try and shoot at it until floch at the very end, in which he missed after Gabi shot him.