I've worked with .NET for over 10 years and we built our startup on top of it. Here are my thoughts:
Pros:
* Stability
* Very decent standard library
* Good balance between productivity and robustness
* Great package management
* Extremely easy to upgrade, so essentially free goodies (performance) every year or so
Cons:
* Very MSFT dominated (obviously)
* Subpar tooling outside of Windows (I'm looking at you C# Dev Kit)
* C# has way to many features, it feels bloated
* Culturally, it feels like .NET devs are less "passionate" about their work
* The freaking stigma of being a .NET dev: you will never be as cool as the guys who work with Node/Python/whatever
Edit: Also I'd like to add EFCore as one of the pros of the ecosystem. Hands down the best ORM. Others don't come close.
Pros:
* Stability
* Very decent standard library
* Good balance between productivity and robustness
* Great package management
* Extremely easy to upgrade, so essentially free goodies (performance) every year or so
Cons:
* Very MSFT dominated (obviously)
* Subpar tooling outside of Windows (I'm looking at you C# Dev Kit)
* C# has way to many features, it feels bloated
* Culturally, it feels like .NET devs are less "passionate" about their work
* The freaking stigma of being a .NET dev: you will never be as cool as the guys who work with Node/Python/whatever
Edit: Also I'd like to add EFCore as one of the pros of the ecosystem. Hands down the best ORM. Others don't come close.