C++ is great language for epic things like UE4. And the whole engine is now extandable. You can use even V8 now, if you want to write a code so much. If you’re not familiar with cpp you can possible create the whole game using blueprints, and that’s really cool 
P.S. - Unreal Script was “easier”, but not so flexible. And we have to use it because of old Kismet limits, now we can make games, not code.