I tend to disagree with the vast majority of the comments here. While The Lucy Show is not I Love Lucy by any means, it still cracks me up every time I watch it.
And yes, the show lost a little something when Vivian left. She and Lucy had an unbeatable on-screen chemistry. However, that doesn't mean the show should be written off entirely just because Viv's not there. I mean, it's Lucy! You really can't lose.
So, bottom line: Watch it! You won't be sorry. I bought a 2 disc DVD set and watched it yesterday and laughed my head off! Try to find the episode where Lucy babysits the monkeys, it's hilarious.
Anyway, that's just my two cents, and it ain't worth much.