Just to be fair, and since you mentioned Julia yourself, it too has the expressivity of macros, the ergonomics of simple syntax and a GC as well as performance (often producing the exact same assembly as hand-optimized C/C++ ran through clang). It also has a full implementation of multiple dispatch, with all of the interesting design implications that follow.

That remark, however, is not to minimize the appeal of Nim, which has other interesting properties as well as native compilation, which is undeniably advantageous in some cases. I hope the tooling matures and the language continues to grow. It certainly deserves a chance.