By definition, the aspects that make a celebrity appealing to one person, will make them unappealing to another - it goes with the territory.
I didn't watch Let It Sine because I thought the format was weak, and I don't like Gary Barlow as a TV presenter (I admire him hugely as a musician), or Mel Geidroych, or Graham Norton, so the whole thing is doomed before it starts for me.
Similarly on ITV, I don't especially like will.a.am, and I can't abide Tom Jones, so The Voice is off my viewing calendar as well.
That said, there are millions who like those celebs, and will enjoy the shows - as I said, that appeal /annoyance is part of the aspect of being on television.