She seems to have started to believe her own publicity, that she's some sort of authentic musical genius, rather than a pedlar of mediocre r&b pastiches (which she admittedly co-writes)
I think strong talented, confident independently minded women in music are great - Patti Smith, Kim Gordon,Le Tigre and the Slits to name but a few. I even think Lady Gaga is the first really interesting and challenging pop megastar of either gender since Prince was in his prime.
Jessie J isn't 'great' and she certainly doesn't have the talent to back up her attitude. She is a supermarket own brand Rhianna/Katy Perry and deserves nothing but our indifference.