The secret rooms get on my nerves also, plus they are not secret, and most of the housemates guess about them, especially when they can hear the work going on. The best BB's had hardly any or no gimmicks at all. It's the gimmicks and too much interferring from BB rather than let the housemates get on with it that ruined many a BB, and gave us end results that were manipulated to achieve.
I did enjoy when BB trashed the house and garden in BB8 though and left the housemates to clear it up

I remember Nicky's face although she and the others took it in good heart