It's not Unity. It's the art assets. When you go to download Unity or Unreal, they have all these gorgeous photos of games made with their engines. That doesn't

It's not Unity. It's the art assets. When you go to download Unity or Unreal, they have all these gorgeous photos of games made with their engines. That doesn't mean using their engine is going to make your game gorgeous. It means that you can pay money for a good artist to create good art and it will run in their engine. Well-crafted art assets are far more important to the look of a game than the specific engine that is used. The reason some "lesser" platforms like WebGL or the various open source game engines look so bad is because they are far more accessible to beginners, beginners who don't have access to good assets.