Luck has said he no longer had the passion it takes to play football. Without the love of the game he wouldn't be the QB we knew him to be.
He was one of the most exciting player I have ever seen. When he retired I was so disappointed. It's easy to dwell on the negatives he put on the team but if he lost the heart to play I wouldn't want him to be the Colts QB.
It has taken me a few years to not be bitter over the timing of his retirement. I understand his decision but as a Colts fan it's still depressing.