Really? I don't share either sentiment. I found multithreading in C++ to be pretty mundane, and in fact a lot easier than it probably once was with lambdas. You definitely need to be on top of the multithreading primitives such as atomics, mutex, condition variables, shared_ptr, etc. But otherwise it's pretty straightforward.
One of the problems I'm usually facing with this is the need to call library functions from C++ code. Especially TLS-related stuff. It doesn't matter what primitives C++ has to offer, as long as you are using library code things will break.
