LucyD - the fact that you prefer Jane McDonald to anyone says volumes about your (lack of ) judgement. We once walked out of a show of hers at half-time having got thoroughly fed up with all the relentless guff about "ma mum int Werkfeeeeeeld" (or wherever she is).
Calman is trying to introduce Cruises to folk who may never have considered such a holiday, and/or a few new locations to existing cruise fans. As such, she does a passable job, once you allow for the degrees of forced jollity that it entails. She must be getting decent viewing figures, as she's been commissioned for more shows.
Oh, and that "TV for stupid" by Sago, big chunks of TV ARE indeed for "the stupid", or perhaps for those with a severely reduced critical faculty. Hence the popularity of assorted Big Brothers, Love Islands, Made in . .half a Dozen places with wannabe 'celebs', and several shows with the odious and massively unfunny 'Keith Lemon'. Etc. Those viewers would probably not like your choices of Radio 3, wall to wall Andre Rieu, or similar fare? Oh, and DO BE CAREFUL walking round the average supermarket, you could catch something from the other customers, and the staff. Be careful out there.