Pacificnorthwest,
It is hard to rank the shows in a specific order because for some it is truly comparing apples to oranges, but in general clumps:
So far my favorite, not necessarily the "best," but most enjoyable for me was The Audience. I absolutely loved Mirren and could watch it once a week if I were able.
In the next group I loved The Visit, Something Rottem!, You Can't Take It With You, Curious Incident, Disgraced, The King and I, Hand to God, Skylight. (Adored Fun Home off-Broadway and will see the Broadway version shortly. Wolf Hall Pt 1 was also exquisite, but feel I can't totally judge it until I see Pt 2 as well.)
I liked, but had some issues with On the Twentieth Century, Heidi Chronicles, Elephant Man, Love Letters, Honeymoon in Vegas, It's Only a Play (w/Nathan...after the cast change it was devoid of laughs), Gigi, A Delicate Balance
Things I was mixed/just alright, but nothing great were The Country House, On the Town, Holler If Ya Hear Me, The Temptations and Four Tops, Fish in the Dark, The River
Things I didn't like were Side Show, This is Our Youth, Constellations, The Real Thing, Finding Neverland, Doctor Zhivago, American in Paris
Bottom Two were It Shoulda Been You and The Illusionists.
The hardest thing for me to place is The Last Ship. The score has grown on me over time and it was professional and sincerely presented...it just left me so cold both times I saw it.
Marie: Don't be in such a hurry about that pretty little chippy in Frisco.
Tony: Eh, she's a no chip!