Well, Stackoverflow is made using .net
When it comes to handling requests it outperforms other popular tech stacks like Java and Node.js
If you want learn it then go ahead, they have invested billion dollars in .net recently, you can do anything robotics, ML, Web application, Mobile App, Desktop App you name it
Microsoft is bashed by the fanatic users of linux or mac.
They have a very good ecosystem for every kind of development. They have the world best programmers. They have produce most valuable books on software engineering and management.
It is more about ecosystem, if you like it, then go for it.