I grew up in the 80's, proud to say, and this show never failed to draw me in, even the somewhat trivial early "yup, that's Molly Ringwald" episodes. Of course, the show became a lot more interesting after "Jo" (Nancy McKeon) arrived sporting her motorcycle helmet and her tough-girl personality which almost immediately conflicted with Blair (Lisa Welchel). I love both characters, and it is easy to see Jo and Blair liked each other more than they ever admitted to.
In all honesty, I can't put my finger on why this show was, and still is, so addicting! I guess it has something to do with the chemistry between the girls and Mrs. Garret, she was more like a mother to them than their own mothers were, especially because Mrs. Garret always took care of them when their parents could not.
I watched episodes many late nights when I was going through hard times, it pulled me through. So for that reason, I am grateful to everyone involved with the show. I still prefer to watch The Facts of Life late at night out of tradition, leading back to Nick At Nite memories.
If I had to pick favorite episodes, it would be the Christmas episodes (which appear to be top rated here on imdb). In fact, I think all of the Christmas episodes were interesting and well-produced. They were just so heart-felt.
Rest In Peace Charlotte Ray, and thank you for the memories!