I have been holding back on this subject because I love me some Christina Aguilera, BUT...
Girl has pipes that would demolish the walls of Jericho just by whispering. Girl had given the finger to corporate music with her second album "Dirty". Girl had put all to shame in "Lady Marmalade". Girl even went her own way with "Ain't No Other Man".
Sometimes imitation is NOT the best form of flattery. Sometimes it is imitation: sorry, flat, and lazy. Girl can do better. Girl can sing better. But if she keeps following a trend instead of creating one? Girl is gonna go down in history as a sell out, or worse...a copy cat.
Wail on, girl. Because no one else can touch you when you do.