I really like her voice. And her goofy way of telling jokes または teasing people is fun to watch. I also like how concerned she is for her members.
I dislike how burdened she seems at times. And the way that she fades into the background, although she's the leader.
I'd like to see her relax a bit more. The Taeyeon of now is much もっと見る subdued than the way she was in GGTS. I understand that people grow up, and that people have these expectations for their idols to be 'perfect', but I like seeing her have fun.