I actually thought the first series of Big Brother was genuinely interesting. (there I said it) It took a fairly wide range of people and just left them to get on with living with each other, and showed the conflicts that arose from being around differenct classes and cultures 24/7.
However, they then went on to screw with the format, carefully selecting housemates to appeal to the demographic that was watching, leading to another 10 series of the same bunch of borderline retarded 20-30 nightclubber types with no variance in interests and nothing of any interest to say. It took a dozen clones and showed what it's like to live with twats 24/7.
Of course, because of the demographic, whenever they'd dare to put someone interesting in, they'd be voted out almost interesting cos 'they just keep talking about stuff when I only watch it to look at Kev ooh aint he got a lovely bum.'
I wouldn't scrap all reality TV however, purely because of one that died after only one series, 'Kings of Comedy', where they took six 'old school' 60s style club comics, and six unknown 'new wave' comedians, and locked em up, and made them perform a 5 minute set each night according to a different rule.
Partly because it defied expectations, because comics generally have a basic level of respect for anyone in the industry, when I imagine the TV execs were drooling over the idea of conflict, and partly because it's genuinely fascinating to watch the minds of comedians at work when they're not on stage.
That's also why Jack Dee is possibly the only Celeb Big Brother contestant I ever cared about.