The Tony Hancock one was given a bad review in the times, so I know people that didn't watch it on the strength of that. The Steptoe one almost had me in tears, but the Hancock one was even worse/better. I didn't know much about the hancock story but the program made it pretty clear. I even looked up the stuff on wiki, http://en.wikipedia.org/wiki/John_Le_Mesurier, I like his last words and the bit he put in the paper.
I think the last one about Frankie Howard might be the best one.