I think its a case of too much money, too little thought but the lame tasks and the bars made a bad situation worse.
Its was hyped as being tougher than ever, blah blah, but by tough, they just meant, "lets get 12 people in a house and bore them to death live on national TV". The housemates haven't bonded as a group like they have in previous years and so there is no sence of comeradery. At the moment, its just 5 people sitting there wishing the next week away. The tasks have been crap. BB producers say its because they wanted the tasks to actually mean something, well they could have. Tell them what the task is mid week, make it hard and test them live on saturday. Make it all or nothing as far as food goes and then you've got your meaning in it and it makes them work for it.
In my opinion, the bars just divided them even more than they all ready were and didn;t help the overall downturn of the programme.
So there! Just my ramblings................