The character of Eren Yeager in Attack on titan is not infallible and has several flaws.
ironically, his biggest mistakes represent significants steps in his especially in the third and final seasons.
Here are Eren Yeager's 10 biggest failures:
in the first half of the third season, Eren is captured by the reiss family,the true ruling family of paradis. learning the true nature and origins of his powers,he nearly condemns paradis to struggle as he gives up hope.
Eren's fight against Annine in the first season of Attack on TItan leaves Stohess District in ruins. The assault eas ill-conceived,resulting in many civilian deaths and widespread destruction.