I can see them being useful for reducing the tedious cases. Especially the failure paths. Otherwise, my view is that if a unit test can be easily auto generated

I can see them being useful for reducing the tedious cases. Especially the failure paths. Otherwise, my view is that if a unit test can be easily auto generated and the code is not already covered by a feature/integration test, then maybe it's a waste of time to look at it. I'd be more interested in integration tests generated from a description... which doesn't work that great yet. Adding the simple unit tests ensures the current design of the internals is suddenly more "final" than before, and maybe more than intended.