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Its series opening on Monday was watched live by an average of 1.2 million viewers - which is down on last year's premiere, which attracted an average of 1.4 million.
The dizzy heights of series two, for example, which saw a total of 13.7 million viewers tune in to Channel 4 to see Brian Dowling crowned the winner, are a distant memory.
How has the show changed since its debut, and who is still tuning in? Let's take a look.

But many of the show's fans object to the blurring of the celebrity lines, with one viewer tweeting: "Why has half of Ex On The Beach gone in Big Brother - thought they were meant to be nobodies?"

In an average day in the office, you're far more likely to hear colleagues talking about Netflix shows such as 13 Reasons Why or Stranger Things than Big Brother.
Such programmes are exciting and new. They are the water cooler TV shows that Big Brother once was.
Having said that, it's worth bearing in mind that 1.2 million BB viewers is not to be sniffed at - that's a huge figure for Channel 5 and one that many other streaming services or Freeview, satellite and cable channels would kill for.

• 70% of the Big Brother's audience is female
• The age group the show is most popular with is 45-54 year olds
• The show is considerably more popular with lower middle class and working class viewers than it is with middle or upper middle class viewers
• Nearly a quarter of viewers live in the north of England, which is the region that most loves BB. 19% are in London. Scotland (14%) and Wales (7%) care far less keen on Big Brother

http://www.bbc.co.uk/news/entertainment-arts-40171096