In my experience, one of the biggest problems is that people approach julia as "python or matlab but faster", which is going to be a recipe for failure. Julia is a very different language with its own idioms and very different style and if people try to just write Python with Julia syntax I can see how problems arise.
To be clear, I do definitely believe there are some big pain points in julia at scale, but depending on the usage domain and needs, my impression is that julia is an appropriate tool for at least some niches.
BTW, this kind of discussion is healthy. The Julia core developers are already taking notes and I'm certain they will continue improving the language or ecosystem.