I don't intend to sound mean, but Lucy got decreasingly funny with each successive show. I don't know if it was the writing, the eras in which they appeared, or my increasing maturity and desire for something smarter and more sophisticated like Mary Tyler Moore. Maybe a combination of all three.
As I recall, the Peter Graves episode was far and away the best one in the series. I gave my review copy to a devoted Lucy friend of mine, so I don't have it here to watch again, but I do remember it fondly (especially compared to the other mostly weak, strained-for-comedy episodes).
I reviewed Life with Lucy on DVD. It's a painful coda to her otherwise admirable television career. I mean, she really tried, and I felt for her as I watched it (both on its original airing and in the DVD box set), but the writers let her down, and the supporting cast were just not up to par.