Node has really earned a solid reputation for API servers, scalable REST services, and with the emerging migration to isomorphic javascript, powering anything that is javascript-based on the frontside...
I've used Loopback, SailsJS, HAPI, ExpressJS and now MERN, and all have their distinct advantages. Why not pick the right tool for the job, and also enjoy focusing on only one core language? That's a huge win for larger development teams too.