She is quite good, but arguably, the most difficult aspect of music is “creating” something that people are willing to pay money to hear.
Lots of "creative" people out there, with no talent of their own, who then have the talented ones perform their stuff.
She has and is developing her talent. As for her creativity, we shall see.
Whether you like her or not, Celine Dion doesn't write her own music. In fact she has done some very good covers of other artists stuff. Such as Tina Turner, Journey, Heart, Eric Carmen...