Its funny that the best xfactor winners vocally make their songs sound the best. Leona - Bleeding Love, Alexandra - Bad boys & Little Mix - Wings. All mediocre songs brought to life with great vocals with charisma and attitude (although for me Leona never matched the vocal style of Bleeding Love)
The thing that saves the song is the bridge which is catch where the rest of the song isn't really. The girls together vocally were fantastic, individually.. okay with Perri by far the best vocally and more confident (i feel she will out grow the group quickly)

I'm suprised that they preformed this on red & black. I thought that the debut preformance was saved for xfactor? i guess with dire ratings they have no choice