Actually I though the spice girls on MKR where being them selves, you could not fake that without a lot of rehearsal.
The where obviously choosed to create a bit of drama and contreversy and get people to tune in, myself having seen how the girls where so critical just had to watch how they went we it was there turn to cook. As expected they bombed out big time. If the show just focused on the cooking in would become boring.
