I hate it! One of the things that I most like to see is when a housemate is evicted, the way the rest of the house react and the new groupings that emerge.
Sticking a recycled housemate in at this stage is both unnecessary and defeats the object of the game and takes away from the housemates who have been in for all these weeks. It makes them look as though they are boring and not enough to keep interest in the show. How would you feel in that situation? It will also prevent the others from developing their characters.
Nikki or anyone else has had their moment. we've seen what they have to offer and in Nikki's case, the effect she has on the house and we evicted her. Why bring her back? She brings nothing new to the party and will more likely than not just go into over hyped staged tantrums. I think I will be switching off.