OK I'm gonna have to strongly disagree with you on multiple fronts. First of all the nurse thing. It's a radio show, she told an interesting anecdote. THAT IS WHAT YOU DO ON RADIO SHOWS. Why the heck did she apologies in the first place? Are nurses exempt to criticism or something? Ridiculous.
If I go to a clinic and the nurses tell me all the doctors are gone and they are all going on break to eat I would wonder wtf was going on too and so would anybody else. She didn't even complain at the clinic or anything which a normal person would have considering such poor organization and communication.
Lipsinging? The hell? There are quite a few performances where she was the only one NOT lipsinging including their first couple in Japan if I'm not mistaken. I'm trying to figure out where that tag is coming from. That week or two during the beginning of Oh where did? I mean did you hear her voice on the radio show? K-will had to fill in for her because she could barely talk fog gods sake. Hell Yuri did it for a couple weeks at the exact same time. Tiffany did it for a couple months during Genie when she had the vocal nodule thing, they all have at some point in some performance. Taeyeon probably the least of anyone.
I've seen pretty much every SNSD variety show, radio interview, most of the boras ect. I'm honestly stumped here.
I mean if one were to say watch the SM town chuseok special they might get the impression Yoona is a camera hog and probably wouldn't know Taeyeon exists, I'm also sure there are instances of the opposite. I honestly don't know how one could paint an overall picture that Taeyeon is doing something extraordinary or has a need to be the center of attention.
You're on the money with the Yoona talk though. Biggest sweetheart there could ever be. Some of the staff posted on their blogs she wrote amazing personalized notes for everyone the last day of her drama, really beyond the call. Same with the way she keeps in contact with people she meets, that lady from intimate note she got along with as well as Gong Hyun Joo both said Yoona has kept in contact more than anyone they have worked with before. Just a while ago a girl that was in training to be in SNSD compared Yoona to Buddha.
And of course Yoona is the one that introduced a lot of the girs before debut. She was kind of the mutual friend between everyone, the keystone. She does have bad days though, and in fact she is the most emo in the dorm according to the girls and talks Hyoyeon and Taeyeon's ears off.