Rihanna Performs at Jay Z's UCLA Concert

I'm a HUGE Rihanna fan...but I might have to think twice before I pay money to see her in concert. Watching her perform "Hard" and "Run This Town" during Jay-Z's show in LA...I'm beginning to think she's a little weak, vocally.

I'm not saying she can't sing, but for all her songs to be in a comfortable alto range...I need her to come a little HARDER!!