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I personally think she's a lovely person from what I see, but unlike the other two panellists didn't have any public profile or known qualifications before her own programme which shot her to fame. Simon Cowell is one of the sharpest around and also seems a lot nicer underneath, and is never rude without being accurate. And he sometimes prefers to go with his own personal preferences than the musical talent, which is his privilege but doesn't mean they couldn't be successful, he just doesn't like them and votes no against the other two.
I almost like the banter in the panel as much as the duff singers. They should have two awards, and do a second for the worst, and then put them in Big Brother. The acts on X factor are far weirder than BB though admittedly would probably not survive two days in the house like Shahbaz this time round. I love reality TV!