No. She fumbled on the first line, but the rest was fine. It wasn't 1993 quality, but it was far from bad. I always thought the reaction was so over the top. People praise Xtina performances with worse vocals.
Some parts where she broke were pretty bad, but most parts sounded more than fine to me
Björk | Christina Aguilera | Mariah Carey | Enya
Cher | Kate Bush | Sia | Barbra Streisand | Lana Del Rey | Lady Gaga | Alanis Morissette | Marina and The Diamonds | M.I.A. | Tori Amos| Florence & The Machine | Ellie Goulding | Sinéad O'Connor | Erykah Badu | Natalia Kills |