Oh God! Here comes my lengthy diatribe...
The key thing that's changed is the production team's attitude towards Big Brother - how they select contestants, how they structure the main show, how they design the house, how they twist the rules, etc, etc.
The average Big Brother contestant now needs to fulfil one of several criteria:
a) They must have been surgically enhanced in some way. Ooh goody. Tabloid column inches ahoy!
b) They must look relatively attractive so that they can either appeal to the teenage girls (if they're male) or be the object of hatred and contention to the same demographic (if they're an attractive female).
c) They must promise in their audition tapes that they're "a b*tch," a "sl*t," they "don't hide the fact they've got a problem with anyone," they "don't take no sh*t," or it's their life ambition to appear in Heat magazine.
d) They must be sexually ambiguous or do something so intensely wacky or crazy that everyone must think they're mad.
In the past, you didn't get this. Or if you did, there was a nice mix of 2-4 mad housemates mixed with a larger grouping of relatively normal (but still interesting) people, who, yes, might live interesting lives, but who are so damn EASIER to associate with. In the last two BBs, we've not managed to get ANYONE like that. The house has been filled with 12 argumentative extroverts. This is all very well for one series, but its been allowed to continue and will probably damage the show in the long run.
Can you remember the excitement that used to be swilling around before eviction nights? In the first 3 BBs, eviction night was a really dramatic, suspenseful time, when the result never seemed certain and Davina seemed to give it her all. We got chats with the families and features on the nominees. This was a really good idea, as it presented a BALANCED view of the nominees and gave them equal airtime. Now we get a 30-minute eviction show taken up with 28-minute-long highlights. Why is this so damaging? Because it allows the producers to edit the previous show in such a way that they don't have to show the nominees in a balanced or equal light. In BBs 1-3, the previous day recap was narrated by Davina inside the studio and lasted on average around 10 minutes. That's all it should be on eviction night. And what's more, Davina didn't go outside to meet the crowd until AFTER the eviction announcement. Which meant no crowd boos/cheers to different names being read out. A much more superior and impartial way of operating.
And that brings me onto the bloody crowd. It used to be quite amusing when the chief enemies and nasty housemates used to get a bad reception in BBs early days, but now nearly all of them get booed. Look at BB6 - there were only a couple of evictions that raised cheers. A couple, out of 15! It's partly to do with a cheapening of BBs image, from an entertaining but experimental Reality TV show to a media driven, Jerry-Springer-a-like, car crash show, with lower production values, half hearted "Oh, we've done enough to get their money anyway" marketing and presentation, and less interesting and exciting housemates (they're either all dislikeable or all disturbed). Also, twists used to be few and far between, so that when one actually happened, it was a HUGE event. They happen every other day now and therefore take the edge off of what would have been incredible ideas should they have been used in moderation. But I watched the first 3 BBs, and I can't stop now. How I long for the BB2 days to return, though!