Jack Shephard was the first person we saw in the series, panning out from his eye. He also ended our island story, as his eye closed. Jack was a main player in the story as he dealt with his past haunts of not being able to live up to his father's wishes and his need to fix everything.
He was a reluctant leader on the island, but things fell apart for him once he got off the island and realized that they never should have left. Along the way, he fell in love with Ana-Lucia and Juliet, but Kate was his true love.
What do you think? Was Jack a good leader?