My experience is Claude and others are good at writing methods and smaller because you can dictate what it should do in less tokens and easily read the code. This closes the feadback loop for me.

I occasionally ask AI to write lots of code such as a whole feature (>= medium shirt size) or sometimes even bigger components of said feature and I often just revert what it generated. It's not good for all the reasons mentioned.

Other times I accept its output as a rough draft and then tell it how to refactor its code from mid to senior level.

I'm sure it will get better but this is my trust level with it. It saves me time within these confines.

Edit: it is a valuable code reviewer for me, especially as a solo stealth startup.