While I agree he didn't get to do anything useful and was mainly put in the story to create the whole love triangle tension crap, I REALLY feel like Gambit came out of that arc smelling like a flipping rose. He remains supportive and respectful of Rogue's agency and continues to care about her even in a soulcrushing scenario where Eric is being cold, unfeeling and selfish when Rogue is injured. And Rogue looks like a complete jerk for choosing a guy that treats her that way over the guy that actually cares about her needs.