First things first, I'm going to enlarge on BnM's beginning legwork by just posting the whole list here for reference. But feel free to read his linked article as well. I always like to read the comments as to what makes a person / critic choice an item for the list and why they recommend it. However, it we are just going to follow his suggestion to talk about our thoughts on the list and what we've seen / haven't seen or would add / replace then it just makes sense to post that basic list here.
50. Sex and the City
49. Avatar: The Last Airbender
48. South Side
47. Vida
46. The Underground Railroad
45. The Crown
44. The Leftovers
43. Anthony Bourdain: Parts Unknown
42. Station Eleven
41. Beef
40. Insecure
39. The Deuce
38. Band of Brothers
37. Crazy Ex-Girlfriend
36. The Shield
35. Chernobyl
34. Jane the Virigin
33. Orange is the New Black
32. Veep
31. Fleabag
30. Game of Thrones
29. Broad City
28. How To With John Wilson
27. Parks and Recreation
26. Battlestar Galactica
25. Review
24. I May Destroy You
23. Survivor
22. Better Things
21 Deadwood
20. Peep Show
19. Rectify
18. Friday Night Lights
17. Halt and Catch Fire
16. Breaking Bad
15. Atlanta
14. Enlightened
13. 30 For 30
12. The Americans
11. The Daily Show
10. Bojack Horseman
09. Freaks and Geeks
08. Girls
07. Better Call Saul
06. Reservation Dogs
05. The Wire
04. 30 Rock
03. Succession
02. The Sopranos
01. Mad Men
And the honorable mentions. America to Me, Arrested Development, Bob’s Burgers, The Good Wife, The Great British Bake-Off, Happy Valley, Harley Quinn, It’s a Sin, Justified, The Office (U.S.), Sense8, Somebody Somewhere, This Country, Up, Watchmen.
I'll also spoiler the list for now in case you want to see the article and surprise yourself as you read along. But be warned, as discussion now continues in this thread, no one needs to abide by spoiler quotes unless you want to get into some plot details and be careful for those that may not have seen a show. As far as series titles and other stuff goes, have it. As well, too, check out the start of the article which explains their criteria for ranking and why you won't see something like Squid Game appearing.
As for me, I am just going to briefly mention that of the 50 series listed, I have seen a large chunk of 14/50 series listed. Most of that was the complete series but some stuff I wasn't too bothered by seeing every episode Like watching every episode of The Daily Show, for instance.. As for the honorable mentions, it's 4/15. About the same percentage. As for what all those shows..... ah, ah. That'll have to be tomorrow. Getting late now. Also there's one really big personal omission as far as I'm concerned but I'll come to that.