My experience with CoPilot has been similar. I don't think it's given me a single piece of code that just worked. It always took several back and forth of me telling the "AI" that I need it to do X instead of Y (which was included in the original instructions but ignored).

It seems to work best if I start with something very simple, and then layer on instructions ("now make it do X").

Where I have found it saves me time is in having to look up syntax or "gotchas" which I would otherwise search StackOverflow for. But as far as "writing code" -- it still feels a long way from that.