I don't know what I like after last year's dismal series, but BBLB has always been a highlight for more. The whole 'Nasty Nick' thing got me hooked from Series 1.
The fact that it's a tv show and, even though the contestants a lot of the time try to be themselves, the fact that we know from the outside that they're being manipulated by the producers. Adds to the entertainment slightly. Does that make any sense?