You know, I used to really dislike Britney. (when she was still talking about virginity while obviously selling sex, just came across as fake to me)
But I have to admit she knows how to put on a show and she has proved that she was not just some teen sensation, since she is still around & selling records.
I respect her for that and she did have and still has some fun songs.
If you see all of her performances back to back you see that she had some very memorable moments (For instance the Mtv 2001 performance of "I'm a slave for you").
The one thing she has that a lot of artists seem to lack at the moment is personality.
You could believe that she was being herself. It is nice seeing that in a performer.
I do not like the lipsynching in concert though and I think if she wouldn't use the baby voice while singing that she would sound much better. I saw some clips of when she was younger and she had a much bigger voice, I don't know why she doesn't show that now.