I feel sorry for Lucille Ball. Once we declared that we Love Lucy, we expected her to be that Lucy character (although reworked a little) in her subsequent Lucy Show and Here's Lucy. She was young enough to carry off the physical comedy in those series, but we seemed unable to allow Ms. Ball to portray any other type of character. She therefore had to have a physical comedy role in order to get back on television.
This time, though, she seemed too old for that physical character and the geriatric version of Lucy trying to do the physical comedy of a Lucy forty years younger just didn't work. The show's concept and scripts were not of good quality and the whole feel of the show was that it was rushed into production without much thought or time being put into its development. It just didn't work as her past three series had. I can't help but wonder if ABC had allowed Miss Ball to play a different type of role and to have the show more script driven than relying on slapstick if maybe she might have had a chance at a hit.
Sadly, we will never know.