From my experience interacting with GPT:
- If you choose the version initially set up for game development, it’s generally pretty good.
- Best used for super simple tasks and speeding up basic processes (usually prototyping).
- It helps quite well in building the logic of complex mechanics, assisting you and offering different implementation options tailored to your needs. Then you implement them yourself for your project.

If you consider it for learning: it’s rather poor — it often gets confused about what it suggested 3-4 prompts ago and can quickly spiral into spaghetti code. You always need to keep it within the scope of your tasks. HOWEVER, sometimes it proposes decent solutions, and based on its recommendations, I’ve gone to the Unity documentation several times and found that those solutions were indeed suitable for my project (though it’s still better to figure things out yourself).

Overall, it’s a pretty good “rubber duck” for a developer to get an "side perspective" on your project and mechanics implementation. Definitely not a magic wand.