Originally Posted by Score:
“I don't think they should have a theme every week. As you say too many of them are vague or repetitive. I'd have around 4 theme weeks scattered across the series (one being Halloween) and go big on them, with studio decorations, outfits, graphics etc. The Halloween show in 2014 was brilliant because they really went for it in a way they hadn't before, so they should do more of that and just not bother with themes outside of those weeks. I like the idea of a mentor switch (on one of the non-theme weeks, as the mentors could choose any song). Keep the week where the public picks the song as well.”
It's strange to recall that, I think, the first two series didn't have theme weeks. They only really took hold in series three.
I'm not sure about ditching them completely as the themes give a hook to the show itself but they can go with bland themes so the focus is on the performances themselves (Number Ones, 21st Century, British Songbook, USA) and have a couple of weeks where the theme controls the show (Halloween definitely, maybe they should have a Musical week?!

It'd be fascinating to see how the show handled that one!)
Originally Posted by Dan R:
“Oh c'mon, it isn't that bad.
It faced a competition with (probably) around double the numbers of what there was last year (a lottery quiz). What exactly were people expecting?”
I think the lottery quiz would have pulled in more than 2m viewers. Casualty couldn't even hit 4m saying that so the competition wasn't overwhelming... not when considering it'll be up against 5m+ rated Antiques Roadshow tonight.
You honestly don't think losing 900k on last week isn't that bad? I'll freely admit it isn't a disaster but it's not great either.