In my opinion, Shakira sounds like a man who is taking steroids to lighten his voice up a bit for his up and coming sex change operation. Then add a shakyness like she is holding a vibrat.....ing apparatus to her voice box.
Sorry if paints a dismal picture of her singing ability but it's the best way I can describe it.
A few of her more traditional Hispanic/Flamenco style stuff are catchy tunes but I would enjoy them more if someone else sang them.
She is good at shakin her stuff though. I expect her concert would have tons of dance appeal.
