I agree with that and I would probably get annoyed if they wasted time telling me all the details - but this week's one on Bruce Forsythe really made me laugh.
SPOILER - DON'T READ ANY MORE IF YOU DON'T WANT TO KNOW WHAT HAPPENS!
They found a passenger list for his grandfather accompanied by a woman, Fanny who was listed as his wife (He was already married to Bruce's grandmother at the time and they found no divorce and remarriage so she wasn't really his wife). But she was using his surname.
So all they had to go on was that Joseph was saying he had married someone called Fanny ? and the age she gave on the passenger list.
They probably did have the right couple (although they didn't show any cross-checking to prove it)... but then the voice over said something like... "and further research told us that her name was Fanny Something (can't remember the name). She was born in X in X year in X place, and worked as a milliner in a shop which is where he probably met her."
Now that is some extrapolition from the name "Fanny"!!!!!
So from then on, he is looking for a marriage and children of Joseph to this Fanny X. And when he finds the children he says - yes that is Fanny, with the right name.
Now presumably they had already found the births of these children and therefor discovered her maiden name- but it is a bit back to front to give him that name first and then let him use it to track down the births.
Encourages very bad practice tut tut
Milly