Aw man, I liked Jon. He added a real "everyman" kind of feel to the show. Someone who, in a world full of superheroes and villains, felt like he would be the next one to get powers, but in a subversion of that expectation, he became the one who helped ground the show in reality, showing us what a son of Superman who feels like he would take after his father but instead took after his mother, would be like living amongst such legendary figures as just a normal guy.
He's had a very interesting arc over the course of the two seasons we've gotten so far, going from a high school football superstar to being humbled and brought down to earth in the long run, yet made stronger and more decent as a person. Where the other characters have their superhuman abilities tested, Jon has had his points of character put to the test: his loyalties to his brother, to his family, and to Candice have all been challenged, his feelings of self-worth and value have been questioned after losing his place on the football team and seeing his brother inherit their father's gifts instead of him, and through it all, he has managed to overcome so much struggle in his life throughout both of the shows two seasons to forge a fascinating path of his own that he is still exploring by the end of the second season. And I really wanted to see where that path would continue afterward in the next season.