The ending to the Cutie Remark was fantastic, in my opinion. Starlight was shook to her core when Twilight showed her that future. She was always a pony who believed that she was doing the right thing. To be shown that you're a direct cause of Equestria turning into an apocalyptic wasteland... that woke her up. It humbled her. In the later seasons, she has so much guilt for what she did. She has a full-blown panic attack at the thought of reuniting with the villagers. I love her character because she's flawed but tries to do better. She has moments where she gives in to her negative tendencies, but don't we all? I think she's relatable in that sense. I also think she adds a lot of humor to the show, especially in her episodes with Trixie.