When it arrived and so important to me professionally. I used it to build my first web apps. I can't tell you how many times I struggled to get started with Rails, Meteor was a foothold beyond compare, they were incredibly focused on keeping the stack accessible to beginners.
They had free command line deployments – meant I could ship projects to friends, before I knew anything about hosting a web server, which was so exciting and really kept me motivated.
The way I do full-stack now, with declarative UI, apollo, Node.js – it's all pretty much the same idea as Meteor apps, just with even bigger communities that really out competed the meteor strack. You could say they're victims of JS explosion/success.
Now I have fantastic job as a full-stack dev, and I doubt I would of made it without Meteor and Discover Meteor PDF. So many cool projects like Apollo, Vue and Storybook came from people involved in the Meteor community.
There's still a huge gap in making accessible full-stack frameworks for web apps. This project is worth a look https://github.com/VulcanJS/Vulcan if you know I mean.