I must say that I do find the hints - when rigorously examined! - very helpful.
On more than one occasion recently, when searching for a female, I have had a hint of a woman with a completely different surname, but same dob/pob. And sure enough, with a bit of diligent searching, I have then turned up the relevant marriage, name of husband, and matched it on a subsequent census with the person I was looking for.
You just have to check the hints carefully as of course - as people have said - they are sometimes well off the mark.