I think the producers can only be blamed for the goings on in the house. To me it's just plain boring, because every day is filled with a suprise or an event. I would prefer one long opening night twist over several little ones over a few days. If they have to do a stunt every day, BB should set mini tasks, like HM's dress up in an awkward costume for the day, they all sit around, do a shopping task, then have a party on friday night. There are so many other ways to get the HM's to be entertaining.
As for the amount of shows per week and timeslots, Channel 9 is definately to blame for that, but when you think about it, all commercial free to air channels are struggling these days. It may not necessarily be better on Ten. I've seen people say it should be on SBS, which would make it a lot better handled, I somehow doubt they'd be able to take it on, due to cost etc.