I was only wee when I used to watch Jim'll Fix It. Even judged by the standards of saturday night light entertainment programming and judged by someone as unformed as i was, I thought JFI was pants.
There was just something perfunctory about the way he managed the program and I felt the man had no warmth towards any of his guests.
The thing about Jim was that (to me anyway) he wasn't really very engaging or competent as a host (he didn't do much at all after JFI finished and TOTP was always a bag of old tut whoever presented it).
His USP was that he was "unmistakable" - the way he looked, the voice, the cigar, the bling. Eminently capable of being instantly recognised even when someone did a crap impression of him. he may have been entertaining but more because people laughed at him than with him. I always suspected he had no real sense of humour whatsoever.
He had "front" but to me he had no real warmth or personality or "hinterland" - he was a very private person it seems, and hard to read.
In the Britain of today everyone has to spill their guts at every opportunity to show how "human" they are - I think Jim resisted that and the lack of disclosure and the plainly "odd" behaviours obviously leads people to conclude there was summat dodgy about him.
Perhaps he was just a one-off or just odd. Perhaps that's just all he was.