Honestly, the usability of C++ in Unreal is top-notch. When I first started using Unreal, I was afraid of C++, but as I stared to use it I became comfortable with it very quickly. I really don’t miss C# that much. The only huge, real, tangible gripe I have is with compile times - I really do miss the 5-second compile for even large projects in unity. In Unreal, it’s a minimum 20 seconds even with Hot Reload.
I haven’t had a to try the mono implementation because it supports older versions of Unreal and my projects need 4.6+ features at point, but it is very promising. The sub-second recompile is one thing I wanna get my hands on! But in the end, I feel like the project may end up just as buggy, if not more so, than blueprints so I might as well just use those. Though is, of course, my own baseless conjecture.