I think the language is really solidly designed, and gives you ridiculously more power AND productivity than python for a whole range of workloads. There are of course issues, but even in the short time I've been following & using the language these are being rapidly addressed. In particular: generally less rich system of libraries (but some Julia libraries are state of the art across all languages, mainly due to easy metaprogramming and multiple dispatch) + generally slow compile times (but this is improving rapidly with caching etc). I would also note that you often don't really need as many "libraries" as you do in python or R, since you can typically just write down the code you want to write, rather than being forced to find a library that wraps a C/C++ implementation like in python/r.