I collected over 24 lists of the Best TV Shows 2020 from the Internet, magazines and newspapers and combined them into one meta-list.  Here are the results: all the shows (including long-running series and miniseries) on three or more of the original source lists, organized by rank (that is, with the TV shows on the most lists at the top).

On 24 lists
I May Destroy You (HBO)

On 16 lists
Better Call Saul (AMC)
Normal People (Hulu)

On 14 lists
Mrs. America (FX on Hulu)
The Queen’s Gambit (Netflix)
What We Do in the Shadows (FX)
Ted Lasso (Apple TV+)

On 11 lists
The Crown (Netflix)

On 9 lists
PEN15 (Hulu)
The Good Lord Bird (Showtime)
City So Real (Nat Geo)

On 8 lists
How to With John Wilson (HBO)
Lovecraft Country (HBO)

On 7 lists
The Mandalorian (Disney+)
BoJack Horseman (Netflix)
The Baby-Sitters Club (Netflix)
Never Have I Ever (Netflix)
Harley Quinn (DC Universe)

On 6 lists
P-Valley (Starz)

On 5 lists
Better Things (FX)
Ramy (Hulu)
Unorthodox (Netflix)
The Great (Hulu)
High Fidelity (Hulu)

On 4 lists
Insecure (HBO)
The Plot Against America (HBO)
We Are Who We Are (HBO)
The Boys (Prime Video)
I Hate Suzie (HBO Max)
Betty (HBO)

On 3 lists
The Haunting of Bly Manor (Netflix)
Schitt’s Creek (Pop)
I’ll Be Gone in the Dark (HBO)
Perry Mason (HBO)