It's nothing impressive. And not good for people who want her rapping.
It's impressive to be multi-talented.
I don't get the problem with her singing on basically every song anyway. She only sings on the hooks NOT the verses (except 'Save Me' & CIO) so it's not like she's doing more singing than rapping.
If she makes an album full of Save Me's I'll be ecstatic anyway. She's not just going to stop rapping, I think she can balance both the singing & rapping effectively, like on Pink Friday.