I've only watched half of the series yet, but I am totally into his changed character. What he would do next is inevitable. In earlier seasons, Eren was always TALKING BIG and end up being captured or hit before anyone else in his squad.
Now I see him much sorted and dependable. I am only talking about his personality and not counting his special powers. It's good that he is no more that SHONEN brat anymore. I would agree with everyone's opinion here that after going through all these wraths, anyone would turn to a silent and cocky person. As I am yet to complete this season, my suspense has grew even more because now I cannot predict what would Eren do next.