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It was okay for basic embarrassingly parallel for loops. I ended up not using any more advanced features, because apart from even worse compiler support, non-trivial multi-threading in C without any safeguards is just too easy to mess up.
OpenMP is one of the easiest ways to make existing code run across CPU cores. In the simplest cases you simply add a single #pragma to C code and it goes N times faster. This is when you're running a function in a loop with no side effects. Some examples I've done: 1) ray tracing. Looping over all the pixels in an image using ray tracing to determine the color of each pixel. The algorithm and data structures are comp…
So easiest depends on the target audience.
OpenMP was pivotal to my last workplace, but because some customers required MSVC, we barely had support for OpenMP 2.0.