Tonight's episode was fab.
I think the dynamic of BB always follows this formula - everyone happy and getting along at first, then arguments start to happen (usually over tasks and shopping!), then divisions build which become more obvious as people start to leave. The last stage - where we now - some big characters leave and the numbers start to dwindle, as they near the final housemates start to get along again and drop their issues, possibly because some allies have left and also because it gets more awkward to be divisive when there are less of you.