They are pretty good at "scaffold this for me" and you adapt as a second step.

That is one of the three uses I give them.

The other two are: infra scripting, which tends to be isolated: "generate a python script to deploy blabla with oarameters for blabla...". That saves time.

The third use is exploring alternative solutions, high level, not with code generation, to stimulate my thinking faster and explore solutions. A "better" and more reasoned search engine. But sometimes it also outputs incorrect information, so careful there and verify. But at least it is successful at the "drop me ideas".

For big systems, generating a lot of code that I have no idea of what I end up with, that when I get bugs is going to be more difficult to modify, understand and track (Idk even the code, bc it outputs too much of it!).

Or for designing a system from zero, code-wise is not good enough INHO.

oh, a fourth thing it does well is code review, that one yes. As long as you are the expert and can quickly discard bs feedback there is always something valuable.

And maybe finding bugs in a piece of code.

Definitely, for designing from scratch it is not reliable.