I have used unity for 2 years - abandoned my first project because it became unmaintainable. But my second attempt has been much more successful. I agree that

I have used unity for 2 years - abandoned my first project because it became unmaintainable. But my second attempt has been much more successful. I agree that unity is good for prototyping, and lots of people have experience with that. Turning it into a finished product is less well-trodden, but not impossible. The best thing I learned was to keep it simple, but not simplistic. It's easy to be too clever, but when you have good boundaries of code and reasonable coupling, it's pretty alright. My project is a bit unique in its simplicity, so i can't say someone with a more complex one wouldn't have more problems. But I'm not running to UE any time soon. Unity works surprisingly well for me, but there is a learning curve.