I can understand that a bit about what you are writing about Nicks, Martha Washington. But I guess I liked it when Nicks voice blended with another singer, than on her own.
I certainly wasn't turned off about her duet with Tom Petty & the Heartbreakers, "Stop Draggin' My Heart Around" and my favorite songs from Fleetwood Mac is when she was in harmony with Christine McVie (such as on "You Make Lovin' Fun", "Don't Stop", etc.) and when she did some work with Bob Welch (I love the tune, "Sentimental Lady"), but I just can't stand Nicks solo or when she was the lead singer of Fleetwood Mac (I hate that the only #1 song for the group was, "Dreams" -- I just cringe when I hear that song).
I remember Black Oak Arkansas, and I agree what an awful lead singer with Jim Dandy.
Another female singer I hated from the 1970's was Janis Ian (when the song, "At Seventeen" was a big hit), I don't mind Ian's work in the 1960's (always have loved, "Society's Child" -- one of the best and most intricate songs ever composed and sung) but by the '70's things started going downhill for Ian.