I think it’s the language of the future.
It’s definitely not the answer for everything – I use Node.js primarily to connect to legacy systems and provide APIs for mobile and single-page apps.
what’s the use? it’s like an opinion about the weather when you can’t change anything about it, lol. no but seriously if you like new shit they’re doing with js then check out asm.js. basically it’s a specification for a subset of that’s compilable. i thought it was pretty neat.