A lot of what dougeebear says is the way I feel. I'll always love Madonna, mostly for what she did in her formative years, but also how she's morphed. I felt the performance was a little TOO clean cut for her standards, which made it seem awkward, but I understand she has young children now and the audience was not necessarily her usual fans, so that's fine.
The lip synching had to happen - no 53 year old could perform that live while moving around that much, so I have no problem with that. The recorded tracks were obviously new, not originals from 1990-whatever, and they sounded really great.
I'm very curious if GaGa will be able to pull off something like that at 53.
That said, I just re-watched MJ's 1993 performance. Wow.