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I started a project 10 years ago, using the Build Engine. I wanted smart enemies, not massive amounts, used in most FPS games. I failed, to this day I have a mental problem with the C language, to develop smart enemies. So I put this project on the shelf, and tested other engines. I found CryEngine, and truly love the advanced ability it offers, not to forget the Sandbox. The price, you need a big team to publish a game. Where do I, an old guy, get 40 top class people for a high risk project?
So, I aimed lower, focus on one aspect of gaming you like - modeling and animating. Meanwhile, I use the Unity 3D engine to build my conceptual maps for my original project, just to enhance my mapping skills. Bottom line instead of making an entire game, I just do what I am good at, and see where it leads.