Edit: I agree Netflix has good Originals. But most are from the early days when they favored quality over quantity. It is sad to see that they reversed that. They have much funding power and should give it to great art that really sticks, has ambitions and something to tell, and values my time instead of mediocrity.
* The Devil's Plan
* Alice in Borderlands
* Extraordinary Attorney Woo
* Brassic
* Back to Life
* Intelligence
* Black Doves
* Top Boy
* Mo
* The Breakthrough
* Borgen
* Love Death & Robots
* Scavenger's Reign
As well as well-known stuff like Stranger Things and Squid Game as a sibling comment mentioned.
[Edit: replies point out some of these are bought rather than produced but I think it still counts for overall quality]