I wouldn't consider Meteor a "backend" tool, but it is still great for a quick start and rapid development. If you're just establishing your project and there's no strong development expertise and culture in your company, Meteor will suit you quite well as it removes the hurdle of making a ton of decisions that will affect your productivity.

Meteor is fullstack, so you can reuse code on the front- and backend, which is nice for validation and business logic.

In the last ten years I worked for more than a dozen startups that based their business successfully on Meteor. Some of them got big and none has regretted it.

I have worked with Nuxt.js, Sapper (now Sveltekit), Play Framework an many more; all great, but for many projects I would still consider Meteor the strongest contender.