I am not a major Torchwood fan, but honestly it has nothing to do with its take on relationships (which I didn't even really notice, to be honest, and certainly have no objection to as content). It was because the show lacks much of the humor and snappy dialog that Dr Who has. I loved the Jack character in Dr Who, especially his love for love of all types and his lively demeanor. But, somehow the character didn't seem to transfer to his new show with the same charm and wit that he had in Dr. Who. It just seemed to lack that hard to define "spark" to me that the other shows had. I can appreciate why others like it, but it just didn't grab me.
Understand, I am really really really picky and have very eclectic taste. So, to each his own. I am a big fan of a number of British shows : The Darling Buds of May, Life on Mars, Foyle's War and many other mystery series, etc. We are in the midst of "Midsomer Murders" and enjoying them thoroughly.