I agree with Tunesmith. Beverly Hillbillies was just great TV.

Perfect escapism

Ridiculing the rich--far more than hillbillies--as a continuing theme.   Perhaps Mudcatters would prefer that hillbillies be ridiculed.

Good scenery (Ellie Mae).

It was the introduction for lots of people to bluegrass--and the highest quality bluegrass---Flatt and Scruggs. ( Obviously if you hate all bluegrass, this would not be a selling point.)

And on top of this, probably one of the all-time best theme-songs ever.