Out of the box yes this is true, but:

1. Custom instructions go a long way
2. Review the code yourself, tell it what to fix, and it will fix it. For me it often takes like 5 rounds of this before the code is fully polished to the point I'm proud of it. And you know what? It's still MULTIPLE times faster than typing code by hand. And at least for me, the quality is higher, because I have 12 different agents that review the work too and they catch additional issues that even I missed.

If you or others ship shitty code don't blame the LLM, the issue is entirely the engineer using it wrong