From a strict point of view, she was a great judge since she made Little Mix win. After having improved throughout the show and found their style, those girls have a great career now and it is thanks to Tulisa.

But the fact is that it was not very "clean" with the Misha B whole story. She was not really correct with her and proved she was ready to use every kind of stratagem to win. I think it's a smart decision from the producers.