The drivel in the morning (Heir Hunters, Homes under the Hammer, Bargain Hunt, Call the Council, Don't Get Dom Get Done...) is all just generally awful, but it does at least serve the purpose of sedating me after a night shift.
The four worst I would say are
1) All "Talent shows", because the format is dead, and there's rarely any actual talent involved. Special shout out to anything owned by Simon Cowell.
2) Googlebox - an absolute cultural nadir. I can't believe that this existed past the first episode.
3) Escape to the Sun - all property shows are bad to some degree. Some are better than others, but I'm pretty sure the people who go on this show are usually just looking for a free holiday.
4) Coronation Street - I don't see this very often, but it seems to somehow get worse every time. The acting is dire. The writing is just bizarre. The stories are repetitive. If this had started airing five years ago, there's no way it'd still exist today.
Can I add a fifth?
5) Deal or No Deal. They're obviously just guessing, but the way they go on... "I'm getting a blue feeling from this box", "I have to choose number seven because my Mum was born on the 7th of July"... would make you think there's some underlying strategy. There isn't. It is just guessing, and the whole thing could be over in five minutes. But they somehow manage to pull it out to one hour of inane drivel that has absolutely no basis in reality.
My parents have Virgin Media, and to be honest I've never found anything that I want to watch that I don't already have on Freeview. When you pay for satellite/cable nowadays, you'll find that the quality is just diluted further with even more drivel.