This is the Rihanna I love, her vocals aren't the best on some of the songs but I much prefer her voice here then I do now she should put this much effort in with her vocals on every performance instead of singing only half of the lyrics. But this performance needed more energy

she just focuses on being charismatic and bringing energy to her show like one navy said instead of focusing on her vocals more. Although her voice has matured a lot, so some of these notes she hits on this performance she wouldn't hit now. She can't hit the notes in Only Girl or S&M anymore, she should go and get some vocal lessons.
She sounds amazing on Hate That I Love You

compare that to her performance at DWT.