I find it can often write correct code but not maintainable, performant, or reviewable code without additional human guidance. The "solution" frequently given is that humans don't need to maintain it anymore so its not actually a problem. But the agent can't be accountable for mistakes, so unless that changes or the risk of a defect is close to zero, one still has to put forth effort to keep the code maintainable.

To be fair, there are plenty of situations where throwaway code is perfectly fine and/or defect risks are low enough to make the trade-off worth it. I don't think a lot of developers are thinking about it in that context, though.

(No unit tests aren't enough)