My experience over the last few months has been v. good. Earlier (maybe even 6 months ago), my sentiment would have more mirrored that of the parent. The main downside at the moment is many of the packages on NuGet don't target dotnet core.

The above opinion is based on my experience developing a Kafka client library (I use OSX / VS Code) for Confluent https://github.com/confluentinc/confluent-kafka-dotnet as well as a substantial side project.