I love both engines so have used both to a fair extent I disagree with your remarks about Blueprint. It is an amazing tool. It makes programming quite easy and intuitive. I'm not sure what problems you've had but my ue4 project has been sailing quite smoothly and it's all mostly Blues. Now, I do know C++ but really a talented Unity coder should be able to jump into 'Unreal C++' with a little time investment. Now as far as transfering an entire project over you might have a fair point.