I have seen a decent amount of clearly AI generated software that's useful, would likely not have been made without AI, and is better for for being AI generated. With AI, people make improvements that they would have never have bothered spending time to do manually. If anything, having uncharacteristically good "production value" in a clearly hobby project is how I typically spot AI use in projects that aren't obvious vibe coded slop.

The code itself may or may not be spaghetti. Not that I care as a user. User experience and code quality had never a particularly strong correlation even before AI.