In general, the language lacks both complex features and low level primitives that would be useful for building anything more substantial than network glue code. Go codebases are often noted for the egregious use of copy and paste. Not that I can say that there's never a time and place for that, but it's not the kind of thing you'd be excited to work with. Give me the language Ken Thompson would solve problems in, not the language he gives his goons to solve problems in.