Note that Go has no 'classes', and doesn't follow what many people consider mainstream OO principles (eg., inheritance), and many people would say this is one of the things that make it so great, specially in large projects (working out a good type hierarchy, and evolving it over time is extremely difficult and painful).

The problem with JavaScript is not lack of 'classes', but a not just dynamic but also very weak type system.

Add to that the callback-hell caused by the async model of things like Node.js, and you end up with something very hard to maintain quite fast.